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core + meta (Meta Extension): terms used within schema.org for schema definitions.

category

Defined in the pending.schema.org extension.
Canonical URL: http://schema.org/category

Thing > Property > category

A category for the item. Greater signs or slashes can be used to informally indicate a category hierarchy.

Usage: Between 50,000 and 100,000 domains
Values expected to be one of these types
Text
Thing
Expected values defined in extensions
PhysicalActivityCategory - defined in the health-lifesci extension
Used on these types
ActionAccessSpecification
Invoice
Offer
Product
Service
Used on types defined in extensions
PhysicalActivity - defined in the health-lifesci extension

Source

https://github.com/schemaorg/schemaorg/issues/1741

Schema Version 3.3