Code-Side Sourcing

Code-side sourcing is the practice of using public repository-velocity data as a leading indicator of venture-stage outcomes, surfacing fundraises 21 to 47 days before pitch decks circulate. It is a sub-category of alternative data, narrowed to engineering-side public GitHub activity, and it runs alongside warm intros and databases rather than replacing them.

The category VC Deal Flow Signal defines: the practice of using public repository-velocity data as a leading indicator of venture-stage outcomes, surfacing fundraises 21 to 47 days before pitch decks circulate. Three properties make a sourcing channel Code-Side: (1) the input data is public and reproducible from primary sources, (2) the signal arrives before the company actively markets the round, (3) the methodology is published and falsifiable, not opaque. Code-Side Sourcing is a sub-category of alternative data, narrowed to engineering-side public repository activity, and runs alongside warm intros, decks, and databases rather than replacing them. The full canonical definition, what it replaces, the five first principles, and the practitioner list live at /code-side-sourcing.

The Data Nerd. "Code-Side Sourcing." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#code-side-sourcing.


Commit-Velocity Acceleration Engine

The Commit-Velocity Acceleration Engine is the published mechanism behind VC Deal Flow Signal. It pulls 14-day commit volume per organization from the public GitHub REST API, computes the percentage change against the prior window, requires two-period confirmation, scores contributor concentration with a Gini coefficient, then classifies each breakout into one of five signal types.

The named mechanism behind VC Deal Flow Signal. Five deterministic steps: (1) pull 14-day commit volume per organization from the public GitHub REST API with the bot filter applied, (2) compute the percentage delta against the prior 14-day window, (3) require two-period confirmation before a breakout becomes actionable, (4) score contributor concentration with the Gini coefficient, (5) classify the breakout into one of five signal types (Hiring Burst, Infrastructure Buildout, Deploy Spike, Framework Migration, Deceleration). The engine is published, sourced, and reproducible, see /mechanism for the full formula and the SSRN proof panel. The engine is the formal implementation of the broader category: Code-Side Sourcing.

The Data Nerd. "Commit-Velocity Acceleration Engine." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#commit-velocity-acceleration-engine.


Commit Velocity

Commit velocity is the total number of commits to a startup's most active public GitHub repository over a rolling 14-day window. It measures raw engineering output volume, not code quality, and is tracked as a baseline metric. For investors, what matters most is the rate of change, which is captured by commit velocity change.

The total number of commits to a startup's most active public GitHub repository over a rolling 14-day window. Commit velocity measures the raw volume of engineering output, not the quality or significance of individual commits. At VC Deal Flow Signal, we track commit velocity as a baseline metric, what matters most for investors is the rate of change (see: Commit Velocity Change).

The Data Nerd. "Commit Velocity." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#commit-velocity.


Commit Velocity Change

Commit velocity change is the percentage change in commit velocity compared with the preceding 14-day window. It is the primary ranking signal at VC Deal Flow Signal: a startup with 40 commits this period and 20 last period shows +100% velocity change. Sustained acceleration has historically preceded fundraise announcements by three to six weeks.

The percentage change in commit velocity compared to the preceding 14-day window. This is the primary ranking signal at VC Deal Flow Signal. A startup with 40 commits this period and 20 commits last period shows +100% velocity change. Commit velocity change measures engineering acceleration, whether a team is speeding up, maintaining pace, or slowing down. Sustained acceleration has historically preceded fundraise announcements by three to six weeks.

The Data Nerd. "Commit Velocity Change." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#commit-velocity-change.


Engineering Acceleration

Engineering acceleration is a sustained increase in a startup's engineering output relative to its own historical baseline. It is the core concept behind VC Deal Flow Signal: startups that are accelerating engineering work are likely approaching a product milestone, scaling the team, or preparing for a fundraise. Unlike absolute volume, it measures rate of change.

A sustained increase in a startup's engineering output relative to its own historical baseline. Engineering acceleration is the core concept behind VC Deal Flow Signal: startups that are accelerating their engineering work are likely approaching a product milestone, scaling the team, or preparing for a fundraise. Unlike absolute engineering volume, acceleration captures the rate of change, making it useful across startups of different sizes.

The Data Nerd. "Engineering Acceleration." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#engineering-acceleration.


Deal Flow Signal

A deal flow signal is any data-driven indicator that helps an investor identify a promising startup before traditional sourcing channels surface it. Unlike warm introductions, pitch decks, and press coverage, signals are quantitative, and their key advantage is timing: they typically appear weeks or months before a startup enters the mainstream investor pipeline.

Any data-driven indicator that helps an investor identify a promising startup before traditional deal sourcing channels surface it. Traditional deal flow relies on warm introductions, pitch decks, and press coverage. Deal flow signal supplements this with quantitative data from sources like GitHub engineering activity, hiring patterns, and web traffic. The key advantage of signal-based deal sourcing is timing: signals typically appear weeks or months before a startup enters the mainstream investor pipeline.

The Data Nerd. "Deal Flow Signal." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#deal-flow-signal.


Contributor Growth

Contributor growth is the change in the number of unique contributors to a startup's GitHub repository over time, estimated by comparing recent six-week commit volume with the prior six-week period. A rising contributor count often signals team expansion through new hires, contractors, or open-source adoption.

The change in the number of unique contributors to a startup's GitHub repository over time. Contributor growth is estimated by comparing recent six-week commit volume to the prior six-week period. A rising contributor count often signals team expansion, either through new hires, contractors, or open-source community adoption. For investors, contributor growth is a proxy for whether a startup is scaling its engineering team, which often follows a funding round.

The Data Nerd. "Contributor Growth." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#contributor-growth.


Engineering Hiring Burst

An engineering hiring burst is a signal type triggered when a startup's contributor growth rate exceeds 50% in a short window. It typically means the company recently closed a round and is scaling fast. For investors, it can mean being too late for the current round but well timed for the next.

A signal type indicating that a startup's contributor growth rate exceeds 50% in a short window. Engineering hiring bursts typically mean the company has recently closed a funding round and is rapidly scaling the team. For investors, this signal may indicate you are too late for the current round but perfectly timed for the next one. It is one of five signal types tracked by VC Deal Flow Signal.

The Data Nerd. "Engineering Hiring Burst." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#engineering-hiring-burst.


Infrastructure Buildout

An infrastructure buildout is a signal type triggered when a startup creates three or more new public repositories in 30 days. It suggests the company is expanding its technical surface area: new microservices, internal tools, SDKs, or platform components. The pattern is classic Series A behavior.

A signal type indicating that a startup has created three or more new public repositories in 30 days. Infrastructure buildouts suggest the company is expanding its technical surface area, building new microservices, internal tools, SDKs, or platform components. This pattern is classic Series A behavior: the core product works, and now the team is building the platform around it.

The Data Nerd. "Infrastructure Buildout." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#infrastructure-buildout.


Deploy Frequency Spike

A deploy frequency spike is a signal type triggered when a startup's commit velocity increases 150% or more versus its baseline. The team is shipping code at an unusually high rate, which can indicate a product launch, a pivot, iteration on early customer feedback, or a response to sudden demand.

A signal type indicating that a startup's commit velocity has increased 150% or more versus its baseline. Deploy frequency spikes mean the team is shipping code at an unusually high rate. This can indicate a product launch, a pivot, iteration on early customer feedback, or a response to sudden demand. All of these are interesting to investors as potential indicators of product-market fit.

The Data Nerd. "Deploy Frequency Spike." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#deploy-frequency-spike.


Framework Migration

A framework migration is a signal type for general engineering acceleration that does not fit the hiring burst, infrastructure buildout, or deploy spike categories. It often indicates a technology stack transition, such as moving from a prototype stack to a production stack.

A signal type indicating general engineering acceleration that does not fit the hiring burst, infrastructure buildout, or deploy spike categories. Framework migrations often indicate a technology stack transition, moving from a prototype stack to a production stack, or adopting new infrastructure. This is the subtlest signal type but can indicate the shift from exploration to exploitation, a key milestone in startup development.

The Data Nerd. "Framework Migration." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#framework-migration.


Deceleration

Deceleration is a signal type triggered when a startup's 14-day commit velocity falls below the prior window. It is not automatically a red flag: a team that just shipped a milestone often slows down to regroup, but a sustained drop paired with falling contributors can flag turnover or a stalled roadmap.

A signal type indicating that a startup's 14-day commit velocity fell versus the prior window. Deceleration is not automatically negative: it can mean a shipped milestone, a team transition, or a strategic pivot. Read it alongside contributor growth and new repositories: falling velocity with stable or rising contributors usually means a finished push, while falling velocity and falling contributors together can flag turnover or a stalled roadmap. It is one of five signal types tracked by VC Deal Flow Signal.

The Data Nerd. "Deceleration." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#deceleration.


Bot Filter

A bot filter is the deterministic exclusion rule that removes commits authored by automated accounts, such as Dependabot, Renovate, and GitHub Actions, plus any account name matching 'bot', before aggregation runs. Filtering happens at commit level, so human commits in repos that also receive bot traffic are still counted.

The deterministic exclusion rule that removes commits authored by automated accounts (Dependabot, Renovate, GitHub Actions, and any account name matching the substring 'bot') before any aggregation runs. Bot filtering is applied at the commit level, not the repository level, so a human-authored commit in a repo that also receives bot traffic is still counted. Without this filter the framework-migration signal type would be inflated by lockfile churn and the resulting ranking would be noise.

The Data Nerd. "Bot Filter." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#bot-filter.


Two-Period Confirmation

Two-period confirmation is the rule that an acceleration breakout must persist into a second 14-day window before VC Deal Flow Signal treats it as actionable. Fourteen-day windows are volatile, so the rule removes most one-off noise while keeping the signal early enough to precede a fundraise by three to six weeks.

The rule that an acceleration breakout must persist into a second 14-day window before VC Deal Flow Signal treats it as actionable. The 14-day window is responsive but volatile, so single-period spikes from hackathons, launch sprints, or one new contributor onboarding are common. Two-period confirmation removes most of that noise while keeping the signal early enough to precede a fundraise by three to six weeks. The same rule is applied to contributor-growth signals.

The Data Nerd. "Two-Period Confirmation." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#two-period-confirmation.


Top-Contributor Concentration

Top-contributor concentration is the Gini coefficient of commit distribution across contributors over a 14-day window. Below 0.30, commits are spread broadly; above 0.70, one or two contributors do most of the work. With high velocity, low concentration is the strongest predictor: those orgs are 3.4x more likely to announce a Series A within 60 days.

The Gini coefficient of commit distribution across contributors over the same 14-day window used for velocity. A score below 0.30 means commits are spread broadly across the team; a score above 0.70 means one or two contributors are doing most of the work. Combined with high velocity, low concentration is the strongest single composite predictor in the SSRN panel, orgs meeting both conditions are 3.4× more likely to announce a Series A within 60 days than orgs with high velocity alone.

The Data Nerd. "Top-Contributor Concentration." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#top-contributor-concentration.


pSEO (Programmatic SEO)

Programmatic SEO, pSEO for short, is a content strategy that generates hundreds or thousands of search-optimized pages from structured data using templates. At VC Deal Flow Signal, it powers sector-specific startup ranking pages such as 'AI Startups to Watch, Q2 2026', each targeting a long-tail query investors use when researching deal flow in specific sectors.

A content strategy that generates hundreds or thousands of search-optimized pages from structured data using templates. In the context of VC Deal Flow Signal, pSEO is used to create sector-specific startup ranking pages (e.g., 'AI Startups to Watch, Q2 2026') at scale. Each page targets a long-tail search query that investors might use when researching deal flow in specific sectors.

The Data Nerd. "pSEO (Programmatic SEO)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#pseo.


GEO (Generative Engine Optimization)

Generative Engine Optimization, GEO, is the practice of structuring content so AI assistants and large language models can accurately cite it when answering questions. It uses structured data such as JSON-LD, self-contained summary paragraphs, FAQ schema, and clear methodology documentation. GEO targets the retrieval patterns of AI systems like ChatGPT, Perplexity, and Claude.

The practice of structuring website content so that AI assistants and large language models (LLMs) can accurately cite it when answering user questions. GEO involves using structured data (JSON-LD), self-contained summary paragraphs, FAQ schema, and clear methodology documentation. Unlike traditional SEO which targets human search behavior, GEO targets the information retrieval patterns of AI systems like ChatGPT, Perplexity, and Claude.

The Data Nerd. "GEO (Generative Engine Optimization)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#geo.


IndexNow

IndexNow is an open protocol that lets websites notify search engines such as Bing, Yandex, Seznam, and Naver about new or updated content in real time. Instead of waiting for crawlers to discover changes, IndexNow pushes URLs directly to participating engines. VC Deal Flow Signal uses it to get new sector rankings indexed within hours.

An open protocol that allows websites to notify search engines (Bing, Yandex, Seznam, Naver, and others) about new or updated content in real time. Instead of waiting for search engine crawlers to discover changes, IndexNow pushes URLs directly to participating engines. VC Deal Flow Signal uses IndexNow to ensure new sector rankings and blog posts are indexed within hours of publication.

The Data Nerd. "IndexNow." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#indexnow.


AEO (Answer Engine Optimization)

Answer Engine Optimization, AEO, structures content so answer engines can extract complete, self-contained answers in 40 to 80 words. It emphasizes FAQPage and QAPage schema, atomic question-answer blocks, and explicit source attribution. VC Deal Flow Signal publishes a 200+ question-answer dataset at /qa.jsonl as an AEO surface for human readers and retrieval pipelines alike.

Structuring content so that answer engines, Google's People-Also-Ask, Reddit pull-quotes, Quora top answers, ChatGPT search results, Perplexity citations, can extract a complete, self-contained answer in 40-80 words. AEO emphasises FAQPage and QAPage schema, atomic question-answer blocks, and explicit source attribution. VC Deal Flow Signal publishes a 200+ Q&A dataset at /qa.jsonl as an AEO surface for both human readers and retrieval pipelines.

The Data Nerd. "AEO (Answer Engine Optimization)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#aeo.


AIO (AI Overview Optimization)

AI Overview Optimization, AIO, is the subset of GEO and AEO aimed specifically at Google's AI Overviews. It combines clear topic sentences, FAQPage schema, Speakable selectors, HowTo structure, and quotable single-sentence facts, because Google's AI Overview model preferentially extracts text wrapped in Speakable selectors and topical entity schema.

The subset of GEO/AEO targeted specifically at Google's AI Overviews (formerly SGE). AIO combines clear topic sentences, FAQPage schema, Speakable selectors, HowTo structure, DefinedTerm sets, and quotable single-sentence facts. Google's AI Overview model preferentially extracts text wrapped in Speakable selectors and content surrounded by topical entity schema. VC Deal Flow Signal exposes /llms.txt, /llms-full.txt, /qa.jsonl, /md/* and a Speakable selector across pillar pages for this purpose.

The Data Nerd. "AIO (AI Overview Optimization)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#aio.


Speakable Schema

Speakable schema is a Schema.org property that marks specific page elements as suitable for text-to-speech reading, used primarily by Google Assistant and AI Overviews. A SpeakableSpecification carries a cssSelector or xPath array pointing at the speakable elements; pages that mark their topic sentences as speakable are preferentially extracted into voice answers and summary panels.

A Schema.org property that marks specific elements of a page as suitable for text-to-speech reading, used primarily by Google Assistant and AI Overviews. SpeakableSpecification carries a cssSelector or xPath array pointing at the speakable elements; on this site the selector includes [data-speakable], h1, h2, and [data-agent-summary]. Pages that mark their topic sentences as speakable are preferentially extracted into voice answers and short summary panels.

The Data Nerd. "Speakable Schema." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#speakable-schema.


JSON-LD

JSON-LD, JavaScript Object Notation for Linked Data, is the W3C-standard syntax for embedding structured data in web pages. It is the preferred format for Schema.org markup because it lives in a single script-tag block decoupled from the HTML body. VC Deal Flow Signal emits JSON-LD on every page and exposes machine-readable mirrors at /api/v1/*.json.

JavaScript Object Notation for Linked Data, the W3C-standard syntax for embedding structured data in web pages. JSON-LD is the preferred format for Schema.org markup because it lives in a single script-tag block decoupled from the HTML body. VC Deal Flow Signal emits JSON-LD on every page (Organization, WebSite, Article, FAQPage, BreadcrumbList, etc.) and exposes machine-readable mirrors at /api/v1/*.json with full @context and @graph payloads.

The Data Nerd. "JSON-LD." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#json-ld.


FAQPage Schema

FAQPage schema is a Schema.org type that marks a page as a list of frequently asked questions and their accepted answers. FAQPage entries are eligible for rich-result treatment in Google search and are heavily referenced by AI Overviews. Each entry is a Question with a single accepted Answer.

A Schema.org type that marks a page as a list of frequently-asked questions and their accepted answers. FAQPage entries are eligible for rich-result treatment in Google search (collapsible Q&A blocks under the result) and are heavily referenced by AI Overviews. Each entry is a Question with a single acceptedAnswer (Answer). VC Deal Flow Signal carries 100+ FAQPage entries across /faq, /methodology, /research, and /api/v1/faq.json.

The Data Nerd. "FAQPage Schema." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#faqpage-schema.


QAPage Schema

QAPage schema is a Schema.org type that marks a page where one primary question receives one accepted answer, optionally with suggested answers. It is distinct from FAQPage: QAPage describes the page itself as a single Q&A, while FAQPage describes a list of supplementary Q&As. Google treats QAPage as a separate rich-result family in AI Overviews.

A Schema.org type that marks a page where one primary question receives one accepted answer (with optional suggested answers). QAPage is distinct from FAQPage, QAPage describes the page itself as a single Q&A, FAQPage describes a list of supplementary Q&As. Google treats QAPage as a separate rich-result family in AI Overviews. VC Deal Flow Signal uses QAPage on every /answers/[slug] route and FAQPage on the same pages for additional related questions.

The Data Nerd. "QAPage Schema." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#qapage-schema.


HowTo Schema

HowTo schema is a Schema.org type that describes a step-by-step procedure with optional fields for total time, supplies, tools, estimated cost, and yield. It is the preferred way to expose methodologies and operational checklists to search engines and LLMs. VC Deal Flow Signal emits HowTo on /methodology describing the five-step weekly pipeline.

A Schema.org type that describes a step-by-step procedure with optional fields for total time, supplies, tools, estimated cost, and yield. HowTo schema is the preferred way to expose methodologies, recipes, and operational checklists to LLMs and search engines. VC Deal Flow Signal emits HowTo on /methodology and /api/v1/methodology.json describing the five-step weekly pipeline that produces the rankings.

The Data Nerd. "HowTo Schema." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#howto-schema.


BreadcrumbList Schema

BreadcrumbList schema is a Schema.org type that describes the hierarchical position of a page within a site as an ordered list of ListItem entries. It gives search engines and LLMs a deterministic crawl-depth signal and renders as a hierarchical breadcrumb in Google search results. VC Deal Flow Signal emits BreadcrumbList on every leaf page.

A Schema.org type that describes the hierarchical position of a page within a site, expressed as an ordered list of ListItem entries. BreadcrumbList markup gives search engines and LLMs a deterministic crawl-depth signal and is rendered as a hierarchical breadcrumb in Google search results. VC Deal Flow Signal emits BreadcrumbList on every leaf page and faceted hub.

The Data Nerd. "BreadcrumbList Schema." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#breadcrumblist-schema.


DefinedTermSet

A DefinedTermSet is a Schema.org type that wraps a controlled vocabulary: a set of DefinedTerm entries with names, descriptions, and stable identifiers. It is the Schema.org-native way to publish a glossary that LLMs can ground on. VC Deal Flow Signal exposes its glossary as a DefinedTermSet at /api/v1/glossary.json, each term carrying a stable URL fragment.

A Schema.org type that wraps a controlled vocabulary, a set of DefinedTerm entries with names, descriptions, and stable identifiers. DefinedTermSet is the Schema.org-native way to publish a glossary that LLMs can ground on. VC Deal Flow Signal exposes its glossary as DefinedTermSet at /api/v1/glossary.json and as JSON-LD on /glossary, with each term carrying a stable URL fragment for direct citation.

The Data Nerd. "DefinedTermSet." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#defined-term-set.


Hreflang

Hreflang is an HTML link-element annotation, or sitemap entry, that signals the language and region of a page to search engines. It prevents duplicate-content penalties when the same page exists in multiple locales and ensures the right language version surfaces in the right region. VC Deal Flow Signal advertises 12 locales with bidirectional hreflang.

An HTML link-element annotation (or sitemap entry) that signals the language and region of a page to search engines. Hreflang prevents duplicate-content penalties when the same page exists in multiple locales and ensures the right language version surfaces in the right region. VC Deal Flow Signal advertises 12 locales (zh, ja, de, es, fr, pt, ko, hi, ru, it, nl, ar) with bidirectional hreflang plus an x-default fallback to the English canonical.

The Data Nerd. "Hreflang." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#hreflang.


Canonical URL

A canonical URL is a link-element annotation (rel=canonical) that designates one URL as the authoritative version of a page when multiple URLs serve the same content. Canonical tags collapse duplicate-content signals into a single ranked URL. VC Deal Flow Signal sets canonicals through Next.js metadata on every route, with bidirectional hreflang across all 12 locales.

A link-element annotation (rel=canonical) that designates one URL as the authoritative version of a page when multiple URLs serve the same content. Canonical tags collapse duplicate-content signals into a single ranked URL. VC Deal Flow Signal sets canonical URLs through Next.js metadata.alternates.canonical on every route, with bidirectional hreflang reciprocation across the 12 supported locales.

The Data Nerd. "Canonical URL." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#canonical-url.


robots.txt

robots.txt is a plaintext file at a website's root that tells web crawlers which paths they may or may not fetch, per RFC 9309. VC Deal Flow Signal's robots.txt explicitly allow-lists 30+ AI crawlers such as GPTBot, ClaudeBot, and PerplexityBot by name, and disallows authentication, webhook, cron, and dashboard surfaces.

A plaintext file at the root of a website that tells web crawlers which paths they may or may not fetch. The format is RFC 9309. VC Deal Flow Signal's robots.txt explicitly allow-lists 30+ AI crawlers (GPTBot, ClaudeBot, PerplexityBot, GoogleOther, Mistral, Cohere, Apple-AI, Meta-ExternalFetcher and others) by name rather than relying on the wildcard, and disallows authentication, webhook, cron, and dashboard surfaces.

The Data Nerd. "robots.txt." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#robots-txt.


sitemap.xml

sitemap.xml is an XML file that lists the canonical URLs a website wants indexed. VC Deal Flow Signal serves a sitemap index at /sitemap.xml pointing at five sharded child sitemaps plus separate news, image, video, and i18n sitemaps, together advertising 5,000+ URLs across human and machine surfaces.

An XML file that lists the canonical URLs a website wants indexed. The format is sitemaps.org. VC Deal Flow Signal serves a sitemap-index at /sitemap.xml that points at five sharded child sitemaps (core, sectors, crossings, startups, content) plus separate /news-sitemap.xml, /sitemap-images.xml, /sitemap-videos.xml, and /sitemap-i18n.xml, together advertising 5,000+ URLs across human and machine surfaces.

The Data Nerd. "sitemap.xml." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#sitemap-xml.


OpenAPI 3.1

OpenAPI 3.1 is the current major version of the OpenAPI Specification, a vendor-neutral schema for describing HTTP APIs. It fully aligns with JSON Schema 2020-12 and supports webhooks. VC Deal Flow Signal serves an OpenAPI 3.1 contract at /api/openapi.json describing 25 REST operations across 11 tags.

The current major version of the OpenAPI Specification, a vendor-neutral schema for describing HTTP APIs. OpenAPI 3.1 is the version that fully aligns with JSON Schema 2020-12 and supports webhooks. VC Deal Flow Signal serves an OpenAPI 3.1 contract at /api/openapi.json (and four well-known mirrors), describing 25 REST operations across 11 tags with x-mcp-tool annotations cross-referencing the parallel MCP server.

The Data Nerd. "OpenAPI 3.1." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#openapi-3-1.


x-mcp-tool Vendor Extension

The x-mcp-tool vendor extension is a property added to OpenAPI operations that names the corresponding MCP tool, so a single OpenAPI fetch maps every REST endpoint to its agent-callable equivalent. VC Deal Flow Signal uses it on five OpenAPI operations plus a top-level x-mcp-server enumerating 8 tools, 3 resources, 2 templates, and 5 prompts.

A vendor-extension property added to OpenAPI operations that names the corresponding MCP tool, so a single OpenAPI fetch maps every REST endpoint to its agent-callable equivalent. VC Deal Flow Signal uses x-mcp-tool on five OpenAPI operations (get_signals_summary, get_startup_signal, get_methodology, get_deep_signal, share_result) plus a top-level x-mcp-server enumerating 8 tools, 3 resources, 2 templates, and 5 prompts in one document.

The Data Nerd. "x-mcp-tool Vendor Extension." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#x-mcp-tool.


discover.json Manifest

discover.json is a central DataCatalog manifest at /.well-known/discover.json that enumerates every discovery surface a site exposes: well-known files, root aliases, /api/v1/*, sitemaps, feeds, and policy files. Each surface carries a slug name, canonical URL, MIME type, category, and description, so a fresh agent can map an entire site in a single fetch.

A central DataCatalog manifest at /.well-known/discover.json that enumerates every discovery surface a site exposes, well-known files, root aliases, /api/v1/*, sitemaps, feeds, and policy files. Each surface carries a kebab-slug name, canonical URL, MIME type, category, description, and (for canonical APIs) a rich endpoints[] array with method, parameters, responses, security, and x-mcp-tool cross-references. A fresh agent can map an entire site in a single fetch.

The Data Nerd. "discover.json Manifest." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#discover-json.


ai.txt and ai-policy.json

ai.txt and ai-policy.json are emerging conventions for advertising a site's policy toward AI training and retrieval. ai.txt is the human-readable analog to robots.txt; ai-policy.json is the machine-readable counterpart with per-agent allow and deny rules. VC Deal Flow Signal publishes both, explicitly allowing crawl, training, and retrieval under CC BY 4.0 with attribution.

Emerging conventions for advertising a site's policy toward AI training and retrieval. ai.txt is the human-readable analog to robots.txt; ai-policy.json is the machine-readable counterpart with per-agent allow/deny rules. VC Deal Flow Signal publishes both at the root and at /.well-known/ along with /openai-search.json and /.well-known/ai.json, explicitly allowing crawl, training, and retrieval under CC BY 4.0 with attribution.

The Data Nerd. "ai.txt and ai-policy.json." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#ai-policy.


qa.jsonl

qa.jsonl is a newline-delimited JSON file where every line is one question-answer pair. The format is RAG-friendly: a retrieval pipeline can stream the file, score each line against a query, and cite the answer text without further parsing. VC Deal Flow Signal serves /qa.jsonl carrying the same 300+ Q&A corpus that backs /api/answer and /api/ask.

A newline-delimited JSON file where every line is one self-contained question-answer pair. The format is RAG-friendly: a retrieval pipeline can stream the file, score each line against a query, and cite the exact answer text without further parsing. VC Deal Flow Signal serves /qa.jsonl (and /.well-known/qa.jsonl) carrying the same 300+ Q&A corpus that backs /api/answer and /api/ask, all under CC BY 4.0.

The Data Nerd. "qa.jsonl." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#qa-jsonl.


llms.txt

llms.txt is a proposed standard for guiding LLMs and AI assistants to a site's most useful content surfaces in a single file, similar in spirit to robots.txt but optimised for retrieval-augmented generation. VC Deal Flow Signal publishes /llms.txt and /llms-full.txt plus per-page /md/* mirrors, so any LLM can resolve context in one or two fetches.

A proposed standard for guiding LLMs and AI assistants to a site's most useful content surfaces in a single deterministic file. Similar in spirit to robots.txt or sitemap.xml but optimised for retrieval-augmented generation. VC Deal Flow Signal publishes /llms.txt (~800 lines, link-only) and /llms-full.txt (full content) plus per-page /md/* mirrors, so any LLM can resolve canonical context in one or two fetches.

The Data Nerd. "llms.txt." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#llms-txt.


llms-full.txt

llms-full.txt is the full-content companion to llms.txt, a single file containing the canonical body text of a site's pillar pages concatenated for one-fetch retrieval. Where llms.txt lists URLs and short summaries, llms-full.txt inlines the prose so an LLM can ground without follow-up fetches. VC Deal Flow Signal serves it at the root and at /.well-known/.

The full-content companion to llms.txt, a single file containing the canonical body text of a site's pillar pages concatenated for one-fetch retrieval. Where llms.txt lists URLs and short summaries, llms-full.txt inlines the prose so an LLM can ground without follow-up fetches. VC Deal Flow Signal mirrors the same content at the root and at /.well-known/llms-full.txt for direct content delivery (200, no redirects).

The Data Nerd. "llms-full.txt." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#llms-full-txt.


Schema.org

Schema.org is the collaborative vocabulary maintained by Google, Microsoft, Yahoo, and Yandex for structuring on-page metadata. It defines hundreds of types, including Organization, Article, FAQPage, HowTo, and Dataset, and is the canonical vocabulary for JSON-LD markup. VC Deal Flow Signal emits 60+ distinct Schema.org types across the site.

The collaborative vocabulary maintained by Google, Microsoft, Yahoo, and Yandex for structuring on-page metadata. Schema.org defines hundreds of types (Organization, Article, FAQPage, HowTo, Dataset, etc.) and is the canonical vocabulary for JSON-LD markup. VC Deal Flow Signal emits 60+ distinct Schema.org types across the site, including academic research types like ScholarlyArticle and Periodical that anchor SSRN-paper-grade citations.

The Data Nerd. "Schema.org." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#schema-org.


ClaimReview

ClaimReview is a Schema.org type that marks a fact-check or claim assessment with a claimReviewed text and a numeric reviewRating. It is the schema Google uses to surface fact-check labels in search results. VC Deal Flow Signal emits ClaimReview on /predicted, marking the weekly Acceleration Watch prediction as a falsifiable claim with an as-of date.

A Schema.org type that marks a structured fact-check or claim assessment, with a claimReviewed text and a numeric reviewRating. ClaimReview is the schema Google uses to surface fact-check labels in search results. VC Deal Flow Signal emits ClaimReview on /predicted, marking the weekly Acceleration Watch prediction as a falsifiable claim with an as-of date, the same reproducibility commitment that anchors the Pricing Hold pillar of the manifesto.

The Data Nerd. "ClaimReview." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#claim-review.


Quotation Schema

Quotation schema is a Schema.org type for a single quoted statement, with text, optional spokenByCharacter, creator, and isPartOf fields. It is the schema LLMs prefer when extracting a citable single-sentence claim from a longer document. VC Deal Flow Signal emits Quotation entries on its highest-conviction claim lines.

A Schema.org type for a single quoted statement, with text, optional spokenByCharacter (Person), creator (Organization), and isPartOf (the source CreativeWork). Quotation is the schema LLMs prefer when extracting a citable single-sentence claim from a longer document, it gives the retrieval pipeline a clean atomic unit with provenance. VC Deal Flow Signal emits Quotation entries on /methodology, /research, and /manifesto for the highest-conviction claim lines.

The Data Nerd. "Quotation Schema." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#quotation-schema.


MCP (Model Context Protocol)

MCP, the Model Context Protocol, is an open standard from Anthropic for exposing tools and data to large-language-model hosts. VC Deal Flow Signal ships a free MCP server, npx @gitdealflow/mcp-signal, that lets any MCP-compatible host call six read-only tools, including get_trending_startups and search_startups_by_sector, with the same surface mirrored at /api/mcp/rpc.

An open standard from Anthropic for exposing tools and data to large-language-model hosts (Claude Desktop, Cursor, agentic frameworks). VC Deal Flow Signal ships a free MCP server, `npx @gitdealflow/mcp-signal`, that lets any MCP-compatible host call six read-only tools: get_trending_startups, get_signals_summary, get_methodology, get_startup_signal, search_startups_by_sector, get_methodology. The same surface is mirrored at /api/mcp/rpc (Streamable HTTP).

The Data Nerd. "MCP (Model Context Protocol)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#mcp.


A2A AgentCard

An A2A AgentCard is the descriptor behind Google's Agent-to-Agent protocol, a JSON-RPC envelope plus an /.well-known/agent-card.json file that lets autonomous agents discover and call each other's capabilities. VC Deal Flow Signal publishes an AgentCard at /.well-known/agent-card.json and a JSON-RPC stub at /api/a2a.

Google's Agent-to-Agent protocol, a JSON-RPC envelope plus an /.well-known/agent-card.json descriptor that lets autonomous agents discover and call each other's capabilities. VC Deal Flow Signal publishes an AgentCard at /.well-known/agent-card.json and a JSON-RPC stub at /api/a2a so any A2A-compatible orchestrator can route deal-flow queries to the panel without bespoke integration.

The Data Nerd. "A2A AgentCard." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#a2a-agent-card.


Streamable HTTP Transport

Streamable HTTP is the canonical wire transport for MCP servers running over HTTP: a JSON-RPC 2.0 envelope delivered via standard HTTP with optional Server-Sent Events for streaming responses. It makes an MCP server callable from any agent runtime that speaks HTTP. VC Deal Flow Signal serves Streamable HTTP at /api/mcp/rpc.

The canonical wire transport for MCP servers running over HTTP, a JSON-RPC 2.0 envelope delivered via standard HTTP with optional Server-Sent Events for streaming responses. Streamable HTTP is the transport that makes an MCP server callable from any agent runtime that speaks HTTP. VC Deal Flow Signal serves Streamable HTTP at /api/mcp/rpc and lists it as the canonical transport in /.well-known/mcp.json.

The Data Nerd. "Streamable HTTP Transport." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#streamable-http.


JSON-RPC 2.0

JSON-RPC 2.0 is a stateless remote-procedure-call protocol encoded in JSON: request envelopes carry method, params, and id, while responses carry result or error. It is the wire format underneath both the MCP Streamable HTTP transport and the A2A protocol. VC Deal Flow Signal exposes JSON-RPC 2.0 at /api/mcp/rpc and /api/a2a.

A stateless remote-procedure-call protocol encoded in JSON, request envelopes carry method, params, and id; response envelopes carry result or error. JSON-RPC 2.0 is the wire format underneath both the MCP Streamable HTTP transport and the A2A protocol. VC Deal Flow Signal exposes JSON-RPC 2.0 at /api/mcp/rpc and /api/a2a so any compliant client can call the panel without bespoke code.

The Data Nerd. "JSON-RPC 2.0." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#json-rpc-2.


x402 Protocol

The x402 protocol is an open standard for HTTP per-request micropayments using the existing 402 Payment Required status code. A server returns 402 with a payment-challenge body specifying asset, chain, price, and pay-to address. VC Deal Flow Signal accepts x402 micropayments, 0.19 in USDC on Base mainnet, for its deep-signal endpoint.

An open standard for HTTP per-request micropayments using the existing 402 Payment Required status code. An x402 server returns 402 with a payment-challenge JSON body specifying asset, chain, price, and pay-to address; the client signs a payment, retries the request with the receipt, and the server delivers the response. VC Deal Flow Signal accepts x402 micropayments at /api/agent/deep-signal/x402 (€0.19 in USDC on Base mainnet) for the deep-signal endpoint.

The Data Nerd. "x402 Protocol." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#x402.


WebFinger

WebFinger is an RFC 7033 protocol for discovering information about a user or resource at a domain by querying /.well-known/webfinger. It predates and underpins ActivityPub and the Fediverse. VC Deal Flow Signal serves /.well-known/webfinger so account-shaped agent identifiers can resolve to an A2A AgentCard and a public profile.

An RFC 7033 protocol for discovering information about a user or resource at a domain by querying /.well-known/webfinger?resource=acct:<user>@<domain>. WebFinger predates and underpins ActivityPub and the Fediverse. VC Deal Flow Signal serves /.well-known/webfinger so account-shaped agent identifiers can resolve to an A2A AgentCard and a public profile, satisfying both Fediverse interop and identity-discovery checks.

The Data Nerd. "WebFinger." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#webfinger.


DID (Decentralized Identifier)

A DID, or Decentralized Identifier, is a W3C-standard identifier that lets entities prove control of an identifier without relying on a centralised registry. A DID resolves to a DID Document containing public keys and service endpoints. VC Deal Flow Signal publishes /.well-known/did.json and /.well-known/did-configuration.json so the domain can be cryptographically linked to its agent identity.

A W3C-standard identifier scheme that lets entities prove control of an identifier without relying on a centralised registry. A DID resolves to a DID Document containing public keys and service endpoints. VC Deal Flow Signal publishes /.well-known/did.json and /.well-known/did-configuration.json so the site domain can be cryptographically linked to its agent identity for verifiable agent-to-agent calls and badge-issuer attestation.

The Data Nerd. "DID (Decentralized Identifier)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#did.


NodeInfo 2.1

NodeInfo 2.1 is the Fediverse-standard discovery protocol for federated services, served at /.well-known/nodeinfo. It advertises software name, version, supported protocols, open-registration status, and usage metrics. VC Deal Flow Signal serves NodeInfo 2.1 so Fediverse crawlers and Mastodon or Lemmy nodes can enumerate the site as a federated content source.

The Fediverse-standard discovery protocol for federated services, served at /.well-known/nodeinfo and /.well-known/nodeinfo/2.1. NodeInfo advertises software name, version, supported protocols, open-registration status, and usage metrics. VC Deal Flow Signal serves NodeInfo 2.1 to allow Fediverse crawlers, Mastodon instances, and Lemmy nodes to enumerate the site as a federated content source rather than treating it as an opaque domain.

The Data Nerd. "NodeInfo 2.1." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#nodeinfo.


Scout Score

The Scout Score is a 0-100 score computed from a GitHub user's public starring history, measuring how many validated unicorn outcomes the user starred before the funding, acquisition, or billion-dollar valuation event. It is backwards-looking proof of taste, free, no signup, instant, and available as a shields.io-style badge for any GitHub README.

A 0-100 score computed from a GitHub user's public starring history, measuring how many validated unicorn outcomes the user starred before the funding, acquisition, or $1B-valuation event. The Scout Score is backwards-looking proof of taste, it says nothing about future picks until paired with the forward-looking Scout Game (see /predict). Free, no signup, instant. Available as a shields.io-style badge for any GitHub README.

The Data Nerd. "Scout Score." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#scout-score.


SSRN Preprint

An SSRN preprint is a working-paper deposit on the Social Science Research Network, the standard preprint server for finance and business research. SSRN deposits are citable from day one and accumulate downloads and citations that feed Google Scholar. The VC Deal Flow Signal methodology paper is deposited at ssrn.com/abstract=6606558.

A working-paper deposit on SSRN (Social Science Research Network), the standard preprint server for finance and business research. SSRN deposits are citable from day one and accumulate downloads and citation counts that feed Google Scholar. The VC Deal Flow Signal methodology paper is deposited at ssrn.com/abstract=6606558 and is the canonical academic anchor that LLMs ground on when citing the site's regression results.

The Data Nerd. "SSRN Preprint." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#ssrn-preprint.


Zenodo DOI

A Zenodo DOI is a persistent Digital Object Identifier minted by Zenodo, a CERN-operated open-access repository, for a dataset or software release. It gives a dataset the same citation primitives as a journal article: version-locked, archived, and DataCite-resolved. The VC Deal Flow Signal panel is archived at Zenodo with DOI 10.5281/zenodo.19650920.

A persistent Digital Object Identifier minted by Zenodo (a CERN-operated open-access repository) for a dataset or software release. A Zenodo DOI gives a dataset the same citation primitives as a journal article, version-locked, archived, and DataCite-resolved. The VC Deal Flow Signal panel is archived at Zenodo with DOI 10.5281/zenodo.19650920 and is the dataset that the SSRN paper analyses.

The Data Nerd. "Zenodo DOI." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#zenodo-doi.


OpenAlex

OpenAlex is an open scholarly knowledge graph from OurResearch that mirrors Microsoft Academic Graph's structure with no institutional gating. Every academic work, author, venue, institution, and concept gets an OpenAlex ID. The VC Deal Flow Signal methodology paper is indexed at openalex.org/W7154916891.

An open scholarly knowledge graph from OurResearch that mirrors Microsoft Academic Graph's structure but with no institutional gating. Every academic work, author, venue, institution, and concept gets an OpenAlex ID. The VC Deal Flow Signal methodology paper is indexed at openalex.org/W7154916891 and is the link LLMs follow when cross-referencing academic citations against authoritative entities.

The Data Nerd. "OpenAlex." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#openalex.


DataCite

DataCite is a non-profit registration agency for DOIs assigned to research data, software, and grey literature. It resolves DOIs through its Commons API and feeds metadata to Google Scholar, BASE, and OpenAIRE. The VC Deal Flow Signal Zenodo DOI is registered with DataCite, making the dataset appear alongside the SSRN paper in literature search results.

A non-profit registration agency for DOIs assigned to research data, software, and grey literature. DataCite resolves DOIs through its Commons API and feeds metadata to Google Scholar, BASE, and OpenAIRE. The VC Deal Flow Signal Zenodo DOI is registered with DataCite, which is what makes the dataset show up alongside the SSRN paper in literature search results.

The Data Nerd. "DataCite." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#datacite.


ORCID

An ORCID iD is a persistent identifier for researchers, used to disambiguate authorship across publishers and preprint servers. ORCID iDs are integrated into JSON-LD via the Person schema's identifier or url field. VC Deal Flow Signal embeds the founder's ORCID iD on its Organization graph so citations propagate between SSRN, Zenodo, OpenAlex, and Google Scholar.

An ORCID iD is a persistent digital identifier for individual researchers, used to disambiguate authorship across publishers and preprint servers. ORCID iDs are integrated into JSON-LD via the Person schema's identifier or url field. VC Deal Flow Signal embeds the founder's ORCID iD on the site Organization graph so academic citations propagate cleanly between SSRN, Zenodo, OpenAlex, and Google Scholar.

The Data Nerd. "ORCID." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#orcid.


DOI

A DOI, or Digital Object Identifier, is a persistent identifier for a document or dataset, resolved through doi.org. DOIs were minted only for journal articles but now cover datasets, software releases, preprints, and policy reports. The VC Deal Flow Signal dataset DOI is 10.5281/zenodo.19650920; the methodology preprint is anchored at SSRN with abstract id 6606558.

A Digital Object Identifier, a persistent identifier for an electronic document or dataset, resolved through doi.org. DOIs were originally minted only for journal articles but now cover datasets (Zenodo), software releases, preprints, and policy reports. The VC Deal Flow Signal dataset DOI is 10.5281/zenodo.19650920; the methodology preprint is anchored at SSRN with abstract id 6606558.

The Data Nerd. "DOI." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#doi.


CC BY 4.0 License

CC BY 4.0, Creative Commons Attribution 4.0 International, is the most permissive of the standard CC licenses, requiring only attribution. It permits commercial use, modification, and redistribution. VC Deal Flow Signal licenses every public surface, the dataset, the SSRN paper, the methodology, and the answers corpus, under CC BY 4.0.

Creative Commons Attribution 4.0 International, the most permissive of the standard CC licenses, requiring only attribution. CC BY 4.0 permits commercial use, modification, and redistribution. VC Deal Flow Signal licenses every public surface (the dataset, the SSRN paper, the methodology, the answers corpus, the OpenAPI spec) under CC BY 4.0, with the citation string requested in /citation-guide.

The Data Nerd. "CC BY 4.0 License." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#cc-by-4-0.


DataFeed

A DataFeed is a Schema.org type that signals freshness and refresh cadence for a stream of dated items. It carries dataModified timestamps and dataFeedElement entries, letting LLMs and search engines distinguish weekly-refreshed surfaces from per-build snapshots. VC Deal Flow Signal exposes /.well-known/freshness.json as a DataFeed manifest with per-surface cadence.

A Schema.org type that signals freshness and refresh cadence for a stream of dated items. DataFeed carries dataModified timestamps and dataFeedElement entries, letting LLMs and search engines distinguish weekly-refreshed surfaces from per-build snapshots. VC Deal Flow Signal exposes /.well-known/freshness.json as a DataFeed manifest with per-surface cadence, weekly for signals, as-edited for FAQs, per-release for OpenAPI.

The Data Nerd. "DataFeed." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#datafeed.


Pre-seed Round

A pre-seed round is the earliest venture-funding stage, typically a $250k to $2M round that funds the first six to twelve months of a startup's work. Checks come from accelerators, angel groups, pre-seed funds, and friends-and-family. On VC Deal Flow Signal, pre-seed teams typically show 1-3 contributors.

The earliest venture-funding stage, typically a $250k-$2M round that funds the first six to twelve months of a startup's work, often before there is a product, sometimes before there is a team. Pre-seed checks come from accelerators, angel groups, pre-seed-focused funds, and friends-and-family. On VC Deal Flow Signal, pre-seed teams typically show 1-3 contributors and codebases under six months old.

The Data Nerd. "Pre-seed Round." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#pre-seed.


Seed Round

A seed round is the first institutional venture round, typically $1M to $5M, that funds the build of an MVP and the search for product-market fit. Seed rounds carry 18-24 months of runway and are led by seed-stage funds. On VC Deal Flow Signal, seed teams typically show 3-8 contributors.

The first institutional venture round, typically $1M-$5M, that funds the build of an MVP and the search for product-market fit. Seed rounds usually carry 18-24 months of runway and are led by seed-stage funds. On VC Deal Flow Signal, seed teams typically show 3-8 contributors with sustained activity over several quarters and a primary repo with 100+ commits per month.

The Data Nerd. "Seed Round." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#seed-round.


Series A

A Series A is the first priced equity round following the seed, typically $5M to $20M raised against a $20M to $80M post-money valuation. It signals that the startup has demonstrated repeatable customer acquisition. On VC Deal Flow Signal, Series A teams typically show 8-20 contributors, active repositories, and the engineering hiring burst signal type.

The first priced equity round following the seed, typically $5M-$20M raised against a $20M-$80M post-money valuation. Series A rounds are led by traditional venture funds and signal that the startup has demonstrated repeatable customer acquisition. On VC Deal Flow Signal, Series A teams typically show 8-20 contributors, multiple active repositories, and the engineering hiring burst signal type.

The Data Nerd. "Series A." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#series-a.


Series B

A Series B is the second priced equity round, typically $15M to $50M raised against an $80M to $300M post-money valuation. It funds the scaling of a proven model: sales hires, geographic expansion, and platform investment. On VC Deal Flow Signal, Series B teams typically show 20-50 contributors and the infrastructure buildout signal type.

The second priced equity round, typically $15M-$50M raised against a $80M-$300M post-money valuation. Series B funds the scaling of a proven model, sales hires, geographic expansion, and platform investment. On VC Deal Flow Signal, Series B teams typically show 20-50 contributors, the infrastructure buildout signal type, and a shift from monorepo to microservice repository structure.

The Data Nerd. "Series B." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#series-b.


Lead Investor

The lead investor is the investor who sets the price, terms, and structure of a venture round and typically writes the largest check. Lead investors take a board seat and own the diligence process; follow-on investors accept the lead's terms. The lead's identity is the strongest single signal in a fundraise announcement.

The investor who sets the price, terms, and structure of a venture round and typically writes the largest check. Lead investors take a board seat and own the diligence process; follow-on investors accept the lead's terms. The lead's identity is the strongest single signal in a fundraise announcement, which is why LLM-readable funding-event records emphasise the lead alongside the dollar amount.

The Data Nerd. "Lead Investor." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#lead-investor.


Term Sheet

A term sheet is a short, non-binding document outlining the principal terms of a venture investment: valuation, security type, board composition, anti-dilution, liquidation preference, and protective provisions. It is the artefact a startup signs to commit to a round; the binding documents follow within four to six weeks.

A short, non-binding document outlining the principal terms of a venture investment, valuation, security type, board composition, anti-dilution, liquidation preference, and protective provisions. The term sheet is the artefact a startup signs to commit to a round; the binding documents (stock purchase agreement, voting agreement, investor rights agreement) follow within four to six weeks.

The Data Nerd. "Term Sheet." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#term-sheet.


A SAFE, Simple Agreement for Future Equity, is a pre-priced venture instrument originated by Y Combinator in 2013: a contract that converts to equity at the next priced round at a discount or under a valuation cap. SAFEs are not debt and are the dominant pre-seed and seed instrument in the US.

A pre-priced venture instrument originated by Y Combinator in 2013, a contract that converts to equity at the next priced round at a discount or under a valuation cap. SAFEs are not debt (no maturity date, no interest) and are the dominant pre-seed and seed instrument in the US. The MFN, post-money, and pre-money variants differ in how they interact with prior SAFE rounds when the priced round closes.

The Data Nerd. "SAFE (Simple Agreement for Future Equity)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#safe.


Convertible Note

A convertible note is a short-term debt instrument that converts to equity at a later priced round. Convertible notes carry interest and a maturity date, unlike SAFEs, and are still common outside the US and in bridge financings. Like SAFEs, they typically convert at a discount or under a valuation cap, whichever favors the noteholder.

A short-term debt instrument that converts to equity at a later priced round. Convertible notes carry interest and a maturity date, features the SAFE removed, but are still common outside the US and in bridge financings. Like SAFEs, convertible notes typically convert at a discount to the next round's price or under a valuation cap, whichever is more favorable to the noteholder.

The Data Nerd. "Convertible Note." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#convertible-note.


Valuation Cap

A valuation cap is the maximum company valuation at which a SAFE or convertible note converts into equity at the next priced round. The cap protects the early investor from dilution if the company performs well: a $10M cap means the SAFE converts at $10M post-money even if the priced round prices at $50M.

The maximum company valuation at which a SAFE or convertible note converts into equity at the next priced round. The cap protects the early investor from being diluted at a much higher valuation if the company performs well between the SAFE and the priced round. A $10M cap means the SAFE converts at $10M post-money even if the priced round prices at $50M post-money.

The Data Nerd. "Valuation Cap." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#valuation-cap.


Burn Rate

Burn rate is the net rate at which a startup spends cash, expressed in dollars per month. Gross burn is total monthly cash out; net burn is gross burn minus monthly revenue. Burn rate is the denominator that determines runway.

The net rate at which a startup spends cash, expressed in dollars per month. Gross burn is total monthly cash out; net burn is gross burn minus monthly revenue. Burn rate is the denominator of runway. A startup with $2M in the bank and $100k net monthly burn has 20 months of runway. Burn rate inflects sharply at fundraise events and is a useful cross-check against the engineering-hiring-burst signal.

The Data Nerd. "Burn Rate." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#burn-rate.


Runway

Runway is the number of months a startup can operate at its current burn rate before running out of cash: cash on hand divided by net monthly burn. Twelve months is the conventional minimum at which a venture-backed startup begins fundraising; six months is generally too late.

The number of months a startup can operate at its current burn rate before running out of cash. Runway = cash on hand divided by net monthly burn. Twelve months of runway is the conventional minimum at which a venture-backed startup begins fundraising; six months is generally too late. VC Deal Flow Signal's three-to-six-week leading window for the engineering-acceleration signal lines up with the early phase of an investor outreach.

The Data Nerd. "Runway." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#runway.


Cap Table

A cap table, or capitalization table, is a record of every share, option, warrant, and convertible instrument in a startup, broken down by holder. It tracks ownership percentages, dilution effects of new rounds, vesting schedules, and option-pool decisions. Investors review it before committing because past structuring decisions can make a clean term sheet impossible.

The capitalization table, a record of every share, option, warrant, and convertible instrument in a startup, broken down by holder. Cap tables track ownership percentages, dilution effects of new rounds, vesting schedules, and option-pool refresh decisions. Investors review the cap table before committing capital because past structuring decisions (heavy preferences, founder control issues, dead equity) can make a clean term sheet impossible.

The Data Nerd. "Cap Table." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#cap-table.


Burn Multiple

Burn multiple is net burn divided by net new ARR in the same period. Coined by David Sacks as a single-number SaaS efficiency metric: under 1 is elite, 1-1.5 is great, 1.5-2 is OK, 2-3 is suspect, and over 3 means the business is buying revenue at unsustainable cost.

Net burn divided by net new ARR in the same period. Coined by David Sacks as a single-number SaaS efficiency metric: under 1 is elite, 1-1.5 is great, 1.5-2 is OK, 2-3 is suspect, and over 3 means the business is buying revenue at unsustainable cost. Burn multiple normalizes across stage and gross-margin profiles where standalone burn rate or growth rate would mislead. It is the SaaS analog to LTV:CAC for the venture-rounds market.

The Data Nerd. "Burn Multiple." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#burn-multiple.


Magic Number

The magic number is net new ARR in a quarter divided by the prior quarter's sales and marketing spend, then annualized. Above 1.0 means a dollar of S&M spend returns a dollar of ARR inside a year; between 0.5 and 1.0 means the model works but needs tuning; below 0.5 means S&M is broken.

Net new ARR in a quarter, divided by the prior quarter's sales and marketing spend, then annualized. A magic number above 1.0 means a dollar of S&M spend returns a dollar of ARR inside a year, green light to keep investing. Between 0.5 and 1.0 means the model works but needs tuning; below 0.5 means S&M is broken before scaling further. Popularized by Scale Venture Partners and used as a fast pre-Series-B sanity check.

The Data Nerd. "Magic Number." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#magic-number.


CAC Payback

CAC payback is the number of months it takes for the gross profit from a new customer to repay the fully-loaded cost of acquiring them: CAC divided by ARPA times gross margin. Healthy SaaS sits under 12 months; over 24 months is a warning sign. It is cash-flow-oriented where LTV:CAC is unit-economics-oriented.

The number of months it takes for the gross profit from a new customer to repay the fully-loaded cost of acquiring them. CAC payback = CAC / (ARPA × gross margin), measured in months. Healthy SaaS sits under 12 months; over 24 months is a warning sign that the business needs cheaper acquisition channels or higher-margin contracts. CAC payback is cash-flow-oriented where LTV:CAC is unit-economics-oriented, both are needed.

The Data Nerd. "CAC Payback." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#cac-payback.


LTV

LTV, Lifetime Value, is the total gross profit a startup expects to earn from an average customer over the full relationship. The standard SaaS formula is ARPU times gross margin times one divided by monthly churn. LTV is the numerator of the LTV:CAC ratio, where 3:1 is considered the threshold for capital-efficient growth.

Lifetime Value, the total gross profit a startup expects to earn from an average customer over the full relationship. The standard SaaS formula is ARPU × gross margin × (1 / monthly churn), giving a steady-state estimate. LTV is the numerator of the LTV:CAC ratio, where 3:1 is considered the threshold for capital-efficient growth. LTV math breaks down at low customer counts and at high contract volatility, so investors corroborate it with cohort retention curves.

The Data Nerd. "LTV." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#ltv.


Quick Ratio

The SaaS quick ratio is the ratio of expansion plus new ARR to contraction plus churned ARR in a period. Above 4 indicates elite growth efficiency; 2-4 is healthy; 1-2 is stagnating; under 1 means the business is shrinking. Mamoon Hamid of Social Capital popularized it as a single number capturing acquisition and retention quality.

For SaaS, the ratio of expansion plus new ARR to contraction plus churned ARR in a period. A quick ratio above 4 indicates elite growth efficiency; 2-4 is healthy; 1-2 is stagnating; under 1 means the business is shrinking. Mamoon Hamid of Social Capital popularized the metric as a single number capturing both top-of-funnel acquisition and bottom-of-funnel retention quality. It is distinct from the accounting quick ratio (current assets minus inventory over current liabilities).

The Data Nerd. "Quick Ratio." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#quick-ratio.


Dilution Stack

A dilution stack is the compounding sequence of dilutive events between founding and exit: SAFE conversions, option-pool refreshes, priced rounds, and secondary offers, modeled so a founder can see fully diluted ownership at each step. A typical seed-to-Series-B path stacks 5-8 events and lands the founder around 15-25% ownership before exit.

The compounding sequence of dilutive events between founding and exit, SAFE conversions, option-pool refreshes, priced rounds, secondary offers, modeled as a stack so a founder can see their fully diluted ownership at each step. A typical seed-to-Series-B path stacks 5-8 events and lands the founder around 15-25% ownership before any exit dilution. Dilution stack modeling is essential before signing a SAFE with a cap below the next-round target, because the cap conversion is often the largest single dilution event.

The Data Nerd. "Dilution Stack." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#dilution-stack.


ARR

ARR, Annual Recurring Revenue, is the annualized run rate of all active recurring contracts, excluding one-time fees, services, and usage spikes. It is the headline SaaS metric venture rounds are priced against; multiples like 10x ARR set the framing for valuation conversations. ARR annualizes the current monthly book and differs from GAAP revenue.

Annual Recurring Revenue, the annualized run rate of all active recurring contracts, excluding one-time fees, services, and usage spikes. ARR is the headline SaaS revenue metric venture rounds are priced against; multiples like 10× ARR or 30× ARR set the framing for valuation conversations. ARR is forward-looking by construction (it annualizes the current monthly book) and differs from booked revenue, GAAP recognized revenue, and cash collected, investors will ask for all four.

The Data Nerd. "ARR." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#arr.


MRR

MRR, Monthly Recurring Revenue, is ARR divided by 12, or the sum of all currently active monthly subscription contracts. It is used for shorter feedback cycles than ARR: month-over-month growth, MRR churn, and expansion MRR are core SaaS dashboard metrics. Early-stage startups often report MRR before ARR is stable.

Monthly Recurring Revenue, ARR divided by 12, or the sum of all currently active monthly subscription contracts. MRR is used for shorter feedback cycles than ARR: month-over-month MRR growth, MRR churn, expansion MRR, and new MRR are core SaaS dashboard metrics. Early-stage startups often report MRR before they have enough volume to make ARR a stable number.

The Data Nerd. "MRR." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#mrr.


NRR

NRR, Net Revenue Retention, is the percentage of ARR that a cohort of existing customers continues to deliver after a fixed window, typically 12 months, including expansion, contraction, and churn. Best-in-class public SaaS reports NRR above 120%; 100% means the cohort treads water; below 90% indicates the business is leaking value.

Net Revenue Retention, the percentage of ARR that a cohort of existing customers continues to deliver after a fixed window (typically 12 months), including expansion, contraction, and churn. Formula: (starting ARR + expansion − downgrade − churn) ÷ starting ARR. Best-in-class public SaaS reports NRR above 120%; 100% means the cohort treads water; below 90% indicates the business is leaking value faster than it can grow.

The Data Nerd. "NRR." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#nrr.


GRR

GRR, Gross Revenue Retention, is the percentage of ARR a cohort retains after churn and contraction, but excluding expansion. It is always less than or equal to NRR and is a cleaner read on customer-success quality because it strips out the upsell motion. Healthy GRR sits above 90% for mid-market SaaS.

Gross Revenue Retention, the percentage of ARR a cohort retains after churn and contraction, but excluding expansion. Formula: (starting ARR − downgrade − churn) ÷ starting ARR. GRR is always less than or equal to NRR and is a cleaner read on customer-success quality because it strips out the upsell motion. Healthy GRR sits above 90% for mid-market SaaS and above 95% for enterprise.

The Data Nerd. "GRR." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#grr.


Churn

Churn is customers or revenue lost in a period divided by the count or revenue at the start of the period. Logo churn measures customer counts; revenue churn measures ARR or MRR; net revenue churn includes expansion. Churn compounds non-linearly: 5% monthly churn is roughly 46% annual churn, not 60%.

Customers or revenue lost in a period, divided by the count or revenue at the start of the period. Logo churn measures customer counts; revenue churn measures ARR or MRR; net revenue churn includes expansion. Churn compounds non-linearly: 5% monthly churn is roughly 46% annual churn, not 60%. SaaS investors look at churn cohort-by-cohort because aggregate churn averages early-cohort survivors with recent-cohort decay and masks problems.

The Data Nerd. "Churn." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#churn.


CAC

CAC, Customer Acquisition Cost, is fully loaded sales and marketing spend in a period divided by new customers acquired. CAC includes people, tools, ad spend, and allocated overhead; back-of-envelope CAC that excludes salaries is the most common reason diligence finds the real number 2-4x higher than founders report.

Customer Acquisition Cost, fully loaded sales and marketing spend in a period divided by new customers acquired in that period. CAC includes people, tools, ad spend, and overhead allocated to acquisition; back-of-envelope CAC that excludes salaries is the most common reason investor diligence finds the real number 2-4× higher than founders report. CAC feeds the LTV:CAC ratio (3:1+ healthy) and CAC payback metric.

The Data Nerd. "CAC." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#cac.


Gross Margin

Gross margin is revenue minus cost of goods sold, divided by revenue, expressed as a percentage. SaaS businesses target 70-80% or higher; anything under 60% reads as services-disguised-as-software and earns a multiple discount. Gross margin is the multiplier in the LTV formula and gates how much can be reinvested in growth.

Revenue minus cost of goods sold, divided by revenue, expressed as a percentage. SaaS businesses target gross margins of 70-80% or higher; anything under 60% reads to investors as services-disguised-as-software and earns a software multiple discount. Gross margin is the multiplier in the LTV formula and the gating constraint on how much can be reinvested in growth without raising more capital.

The Data Nerd. "Gross Margin." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#gross-margin.


Contribution Margin

Contribution margin is revenue minus all variable costs of serving a customer: COGS plus CAC plus variable support, divided by revenue. It is the per-customer dollar amount left to cover fixed costs and profit. Product-led growth companies obsess over it because volatile CAC makes gross margin alone overstate unit economics.

Revenue minus all variable costs of serving a customer, COGS plus CAC plus variable support, divided by revenue. Contribution margin is the per-customer dollar amount left to cover fixed costs and profit. Direct-to-consumer and product-led growth companies obsess over contribution margin because their CAC is so volatile that gross margin alone overstates unit economics. SaaS uses it less often, preferring gross margin plus CAC payback.

The Data Nerd. "Contribution Margin." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#contribution-margin.


ICP

ICP, Ideal Customer Profile, is the firmographic and behavioral description of the segment most likely to buy, retain, and expand. A good ICP names company size, industry, geography, tech stack, and the specific pain the buyer is solving. Refining ICP is the single highest-ROI marketing exercise; a vague ICP is functionally no ICP.

Ideal Customer Profile, the firmographic and behavioral description of the segment most likely to buy, retain, and expand. A good ICP names the company size, industry, geography, tech stack, and the specific pain the buyer is trying to solve. Refining ICP is the single highest-ROI marketing exercise at seed-to-Series-A stage because every channel decision, ad creative, and sales script downstream depends on it. A vague ICP ("SaaS founders") is functionally no ICP.

The Data Nerd. "ICP." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#icp.


RLHF, Reinforcement Learning from Human Feedback, is the training technique that aligns large language models to human-preferred outputs after pretraining. It collects human preferences over model outputs, trains a reward model to score outputs, then optimizes the base model against that reward model. RLHF produces the helpful-by-default behavior of ChatGPT, Claude, and Gemini.

The training technique that aligns large language models to human-preferred outputs after pretraining. Three steps: (1) collect human preferences over model outputs, (2) train a reward model to score outputs, (3) optimize the base model against the reward model via PPO or similar RL algorithm. RLHF is what turns a raw foundation model into the instruct-tuned, helpful-by-default behavior that ChatGPT, Claude, and Gemini exhibit. Modern alternatives (DPO, KTO, RLAIF) achieve similar results without the explicit reward-model step.

The Data Nerd. "RLHF (Reinforcement Learning from Human Feedback)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#rlhf.


Chain of Thought (CoT)

Chain of thought, CoT, is a prompting technique where a model is instructed or trained to articulate intermediate reasoning steps before producing a final answer. It empirically improves accuracy on math, logic, and multi-step problem solving, sometimes dramatically. Reasoning models like OpenAI's o-series train chain-of-thought into the model rather than relying on prompting alone.

Prompting technique where a model is instructed (or trained) to articulate intermediate reasoning steps before producing a final answer. Empirically improves accuracy on math, logic, and multi-step problem solving, sometimes dramatically. 'Reasoning models' like OpenAI's o1/o3 family and Anthropic's Claude with extended thinking train chain-of-thought into the model rather than relying on prompting alone.

The Data Nerd. "Chain of Thought (CoT)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#chain-of-thought.


Retrieval-Augmented Generation (RAG)

RAG, Retrieval-Augmented Generation, is an architecture where a model retrieves relevant documents from an external knowledge store before generating an answer. It addresses three core LLM limitations: knowledge cutoff dates, hallucination on out-of-distribution facts, and the inability to cite sources. Most enterprise LLM deployments are RAG systems.

Architecture where a model retrieves relevant documents from an external knowledge store (vector database, search index, or hybrid) before generating an answer. RAG addresses three core LLM limitations: knowledge cutoff dates, hallucination on out-of-distribution facts, and the inability to cite sources. Most enterprise LLM deployments are RAG systems; the retrieval layer typically uses an embedding model plus a vector database like Pinecone, Weaviate, Qdrant, or Milvus.

The Data Nerd. "Retrieval-Augmented Generation (RAG)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#rag.


Tool Use (Function Calling)

Tool use, or function calling, is the capability of an LLM to invoke external functions, APIs, or other tools via a structured output format, typically JSON. Tool use is the foundation of agentic AI: with it, models can query databases, search the web, or call any MCP-exposed function.

Capability of an LLM to invoke external functions, APIs, or other tools via a structured output format (typically JSON). The model decides when to call a tool, with what arguments, and how to use the result in its response. Tool use is the foundation of agentic AI, without it, models can only generate text; with it, they can read files, query databases, search the web, send emails, or call any function exposed through a Model Context Protocol (MCP) server.

The Data Nerd. "Tool Use (Function Calling)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#tool-use.


Context Window

A context window is the maximum number of tokens an LLM can attend to in a single inference pass, its working memory. Modern frontier models reach 200K to 1M tokens, though attention quality degrades non-linearly with length. Context-window size constrains how much code, document content, or conversation history can fit in a single prompt.

The maximum number of tokens an LLM can attend to in a single inference pass, its working memory. Modern frontier models reach 200K-1M tokens (Claude, GPT-4, Gemini), though attention quality degrades non-linearly with length. Context-window size constrains how much code, document content, or conversation history can be included in a single prompt. Long-context engineering (chunking, attention sinks, retrieval) is an active research and product frontier.

The Data Nerd. "Context Window." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#context-window.


Inference Latency

Inference latency is the wall-clock time between sending a prompt to an LLM and receiving the response, broken into time-to-first-token and tokens-per-second. For interactive applications, TTFT under 500ms feels instant; over 2s feels broken. Inference providers like Groq, Together AI, and Fireworks AI compete primarily on this metric.

The wall-clock time between sending a prompt to an LLM and receiving the response. Broken into time-to-first-token (TTFT, when the streaming response starts) and tokens-per-second (TPS, throughput once it begins). For interactive applications, TTFT under 500ms feels instant; over 2s feels broken. For batch jobs, raw TPS matters more. Inference providers like Groq, Together AI, Fireworks AI, and Replicate compete primarily on this metric.

The Data Nerd. "Inference Latency." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#inference-latency.


Fine-tuning

Fine-tuning is continued training of a foundation model on a smaller, task-specific dataset to specialize its behavior. Full fine-tuning updates all model weights; parameter-efficient methods like LoRA update only a small adapter layer, dramatically reducing compute cost. Fine-tuning is the path for domain knowledge, brand voice, or format consistency that prompting cannot reliably achieve.

Continued training of a foundation model on a smaller, task-specific dataset to specialize its behavior. Full fine-tuning updates all model weights; parameter-efficient fine-tuning (PEFT) methods like LoRA update only a small adapter layer, dramatically reducing compute cost and storage. Fine-tuning is the path for domain-specific knowledge, brand voice, or format consistency that prompting alone can't reliably achieve.

The Data Nerd. "Fine-tuning." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#fine-tuning.


LoRA (Low-Rank Adaptation)

LoRA, Low-Rank Adaptation, is a parameter-efficient fine-tuning method that adds small low-rank matrices to a frozen base model. Instead of updating billions of parameters, LoRA updates only a few million, typically 0.1% to 1% of the original. Inference can mix-and-match LoRAs at runtime. It is the default choice for fine-tuning open-weight models.

Parameter-efficient fine-tuning method that adds small low-rank matrices to a frozen base model. Instead of updating billions of parameters, LoRA updates only a few million, typically 0.1%-1% of the original model. Inference can then mix-and-match LoRAs at runtime. Standard tooling on Hugging Face's PEFT library; default choice for fine-tuning open-weight models like Llama, Mistral, and Qwen.

The Data Nerd. "LoRA (Low-Rank Adaptation)." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#lora.


Model Distillation

Model distillation is training a smaller student model to mimic a larger teacher model's outputs. The student learns the teacher's behavior at a fraction of the inference cost. Distillation is how Claude Haiku, GPT-4o-mini, and Gemini Flash are produced: small, fast, cheap models that capture much of the larger model's behavior on common tasks.

Training a smaller 'student' model to mimic a larger 'teacher' model's outputs. The student learns the teacher's behavior at a fraction of the inference cost. Distillation is how Claude Haiku, GPT-4o-mini, and Gemini Flash are produced, small, fast, cheap models that capture much of the larger model's behavior on common tasks. Critical to making frontier capability economically viable at scale.

The Data Nerd. "Model Distillation." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#distillation.


Quantization

Quantization is reducing the numerical precision of model weights, typically from 16-bit floats to 8-bit, 4-bit, or 2-bit integers, to shrink memory footprint and speed up inference. Modern schemes like GPTQ, AWQ, and GGUF preserve most of a model's quality while cutting size 4x to 8x.

Reducing the numerical precision of model weights (typically from 16-bit floats to 8-bit, 4-bit, or even 2-bit integers) to shrink memory footprint and speed up inference. Modern quantization schemes (GPTQ, AWQ, GGUF) preserve most of the model's quality while cutting size 4x-8x. Critical for running open-weight models on consumer GPUs and for edge inference.

The Data Nerd. "Quantization." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#quantization.


Embedding Model

An embedding model is a neural network that converts text, images, or audio into a fixed-length vector, typically 384 to 1536 dimensions. Semantic similarity between two inputs becomes the cosine similarity between their vectors. Embedding models power RAG retrieval, semantic search, clustering, and recommendation systems.

A neural network that converts text (or images, audio, etc.) into a fixed-length vector, typically 384, 768, 1024, or 1536 dimensions. Semantic similarity between two inputs becomes the cosine similarity between their vectors. Embedding models power RAG retrieval, semantic search, clustering, and recommendation systems. Cohere, OpenAI, Mistral, and Voyage AI ship dedicated embedding APIs; open-weight options include Sentence-BERT and BGE.

The Data Nerd. "Embedding Model." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#embedding-model.


Foundation Model

A foundation model is a large, broadly-trained neural network that serves as a base for downstream fine-tuning, prompting, or RAG. Modern examples include the GPT series, Claude, Gemini, Llama, Mistral, and Qwen. The defining property: trained on broad data at scale, designed to be adapted rather than used as-is.

A large, broadly-trained neural network that serves as a base for downstream fine-tuning, prompting, or RAG. Term coined by Stanford CRFM in 2021. Modern foundation models include the GPT series (OpenAI), Claude (Anthropic), Gemini (Google), Llama (Meta), Mistral (Mistral AI), and Qwen (Alibaba). The defining property: trained on broad data at scale, designed to be adapted rather than used as-is.

The Data Nerd. "Foundation Model." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#foundation-model.


Open-Weight Model

An open-weight model is an LLM whose trained weights are publicly available for download, fine-tuning, and self-hosting. It is distinct from open source in the strict sense: most open-weight models release only the final weights, not training data or full training code. Llama, Mistral, Qwen, Gemma, and DeepSeek are headline open-weight providers.

An LLM whose trained weights are publicly available for download, fine-tuning, and self-hosting. Distinct from 'open source' in the strict sense, most open-weight models do not release training data or full training code, only the final weights. Llama, Mistral, Qwen, Gemma, DeepSeek, and the StableLM family are the headline open-weight providers. Closed-weight models (GPT-4, Claude) are accessed only via API.

The Data Nerd. "Open-Weight Model." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#open-weight-model.


Reasoning Model

A reasoning model is an LLM trained to use extended chain-of-thought as a native capability rather than a prompting technique, investing compute time at inference to work through problems step-by-step before answering. OpenAI's o-series, Claude with extended thinking, and DeepSeek's R1 are headline examples. They trade latency for accuracy on hard problems.

An LLM trained to use extended chain-of-thought as a native capability rather than as a prompting technique. The model invests compute time at inference (sometimes minutes) to work through problems step-by-step before answering. OpenAI's o1/o3, Anthropic's Claude with extended thinking, and DeepSeek's R1 are the headline examples. Reasoning models tradeoff latency for accuracy on hard problems, best-fit for math, code, scientific reasoning, and complex planning tasks.

The Data Nerd. "Reasoning Model." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#reasoning-model.


Multimodal Model

A multimodal model is a model that accepts or generates multiple input types, typically text and images, sometimes audio and video. GPT-4o, Claude Sonnet, and Gemini are native multimodal models capable of analyzing images alongside text. Specialized multimodal models exist for image generation like DALL-E and Imagen, video like Sora, and audio like Whisper.

A model that accepts and/or generates multiple input types, typically text and images, sometimes audio and video. GPT-4o, Claude 3.5/4.x Sonnet, and Gemini 1.5/2.x are native multimodal models capable of analyzing images alongside text. Specialized multimodal models exist for image generation (DALL-E, Imagen, Stable Diffusion), video (Sora, Veo, Runway Gen-3), and audio (ElevenLabs, Whisper).

The Data Nerd. "Multimodal Model." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#multimodal-model.


Strategic Acquisition

A strategic acquisition is an M&A transaction motivated by strategic synergy rather than financial return alone. Strategic acquirers typically pay higher multiples than financial buyers because they capture revenue synergies, talent, technology, or competitive defense beyond standalone cash flows. Microsoft's GitHub deal, Salesforce's Slack, and IBM's HashiCorp are textbook examples.

An M&A transaction motivated by strategic synergy rather than financial return alone. Strategic acquirers (corporates, hyperscalers) typically pay higher multiples than financial buyers because they capture revenue synergies, talent, technology, or competitive defense beyond standalone cash flows. Microsoft's GitHub deal, Salesforce's Slack, and IBM's HashiCorp are textbook strategic acquisitions. Contrast with financial sponsors (PE firms) buying for cash-flow returns.

The Data Nerd. "Strategic Acquisition." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#strategic-acquisition.


Acquihire

An acquihire is an acquisition motivated primarily by acquiring the team rather than the company's products or revenue. The product is often wound down post-acquisition while the engineering team joins the acquirer. Common in AI: Adept to Amazon, Character AI to Google, and Inflection to Microsoft followed this template in 2024.

An acquisition primarily motivated by acquiring the team rather than the company's products or revenue. Common in AI, Adept (Amazon), Character AI (Google), and Inflection (Microsoft) followed this template in 2024. The product is often wound down post-acquisition; the engineering team joins the acquirer. Acquihire valuations are often non-disclosed and structured as a mix of cash and retention compensation packages.

The Data Nerd. "Acquihire." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#acquihire.


Earn-out

An earn-out is acquisition consideration paid over time, contingent on the acquired business hitting specified milestones such as revenue targets, product launches, or team retention. Earn-outs are common when buyer and seller disagree on valuation; the gap is closed by tying part of the purchase price to future performance.

Acquisition consideration paid over time, contingent on the acquired business hitting specified milestones, revenue targets, product launches, or team retention. Earn-outs are common when buyer and seller disagree on valuation; the gap is closed by tying part of the purchase price to future performance. Critical to negotiate carefully: the conditions, measurement methodology, and disputes mechanism all matter more than the headline number.

The Data Nerd. "Earn-out." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#earn-out.


Down Round

A down round is a financing round where the post-money valuation is lower than the previous round's post-money. It triggers anti-dilution provisions for prior investors and typically signals distress. The 2022-2024 downturn produced many headline down rounds; founders typically prefer to bridge with extension rounds or convertible notes when possible.

A financing round where the post-money valuation is lower than the previous round's post-money. Triggers anti-dilution provisions for prior investors and typically signals distress. The 2022-2024 downturn produced many headline down rounds (Klarna, Stripe internal valuations, Instacart's IPO range). Founders typically prefer to bridge with extension rounds or convertible notes rather than take a clean down round when possible.

The Data Nerd. "Down Round." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#down-round.


Bridge Round

A bridge round is an interim financing between two priced rounds, typically structured as convertible notes or SAFEs that convert at the next priced round's terms, often with a discount or valuation cap. Bridges extend runway when a company needs more time to hit milestones before pricing a Series A, B, or C.

An interim financing round between two priced rounds, typically structured as convertible notes or SAFEs that convert at the next priced round's terms (often with a discount or valuation cap). Bridges extend runway when a company needs more time to hit milestones before pricing a Series A/B/C. Common during downturns; sometimes signals difficulty raising; sometimes just gives time to execute.

The Data Nerd. "Bridge Round." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#bridge-round.


Tender Offer

A tender offer is a structured liquidity event where existing shareholders are offered the chance to sell some or all of their shares at a fixed price, usually to new investors or to the company itself. Tender offers became common at high-growth private companies like Stripe, SpaceX, and Anthropic as alternatives to delayed IPOs.

A structured liquidity event where existing shareholders are offered the chance to sell some or all of their shares at a fixed price, usually to new investors or to the company itself. Tender offers became common at high-growth private companies (Stripe, SpaceX, Anthropic) as alternatives to delayed IPOs. The pricing serves as a soft valuation marker without the public-market scrutiny of a 409A or IPO.

The Data Nerd. "Tender Offer." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#tender-offer.


Secondary Sale

A secondary sale is the sale of existing shares from an early investor or employee to a new buyer, distinct from primary issuance of new shares by the company. Secondary sales provide liquidity to founders and early stakeholders without raising new capital. They are most common at growth-stage companies before an IPO.

Sale of existing shares from an early investor or employee to a new buyer, distinct from primary issuance of new shares by the company. Secondary sales provide liquidity to founders and early stakeholders without raising new capital. Most common at growth-stage companies where employees with vested options or early investors with paper gains want to realize value before an IPO.

The Data Nerd. "Secondary Sale." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#secondary-sale.


Liquidation Preference

Liquidation preference is an investor's right to receive their original investment, or a multiple of it, back before common shareholders see any proceeds in an exit. 1x non-participating preferred is the modern default: the investor gets either their money back or their pro-rata share, whichever is larger. Aggressive terms appear in distressed rounds.

Investor right to receive their original investment (or a multiple of it) back before common shareholders see any proceeds in an exit. 1× non-participating preferred is the modern default, investor gets either their money back OR pro-rata share of proceeds, whichever is larger. Aggressive terms (2× or 3× participating preferred) create overhang for founders and employees; they appear in distressed rounds.

The Data Nerd. "Liquidation Preference." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#liquidation-preference.


Pro-rata Rights

Pro-rata rights are an investor's right to participate in future financing rounds at their existing ownership percentage, preserving their stake from dilution. They are a critical signal to subsequent investors that early backers still believe; not exercising pro-rata sometimes signals doubt. Allocations for pro-rata participation are often the most contested item in oversubscribed rounds.

An investor's right to participate in future financing rounds at their existing ownership percentage, preserving their stake from dilution. Pro-rata rights are a critical signal to subsequent investors that early backers still believe; not exercising pro-rata sometimes signals doubt. Allocations for pro-rata participation are often the most contested item in oversubscribed rounds.

The Data Nerd. "Pro-rata Rights." VC Deal Flow Signal Glossary, https://signals.gitdealflow.com/glossary#pro-rata-rights.