Knowledge Graph Machine Identifier — the persistent, globally unique identifier assigned by Google’s Knowledge Graph to disambiguated entities. KGMID assignment is evidence that an entity has crossed the disambiguation threshold: Google’s entity resolution system has determined with sufficient confidence that this entity is distinct, real, and worth tracking. Entities without KGMIDs are not disambiguated in Google’s knowledge infrastructure and are mechanically disadvantaged in retrieval contexts. KGMID is not ‘nice to have’ — it is the formal entry credential to identity sovereignty.