Ontology & Taxonomy Notebook

A taxonomy sorts things into a tree, from broad to specific. An ontology also names how the things relate. This notebook keeps the ones that decide how businesses and products get filed: 6 industry and category lists with 73,261 categories, side by side, and the schema.org vocabulary that search engines document for structured data.

Industry and category lists

All 6 lists on one page, with one search across them and a diagram of where their names overlap.

OpenAI announced Businesses in ChatGPT on 10 November 2026 but has not published this category list. This page is a snapshot of the list in ChatGPT's business hub web app, read on 11 November 2026, and it may change. "V1" is this site's label.

Vocabularies

  • Schema Swarm

    3,025 schema.org terms, 45 search and AI engines

    What each engine documents about structured data, checked against a page you choose.

  • The AI Intelligence Graph

    The AI Notebook's map of the field

    How the parts of AI connect, in the AI Notebook.