category

Thing > Property > category

A category for the item. Greater signs or slashes can be used to informally indicate a category hierarchy.
Values expected to be one of these types
PhysicalActivityCategory
Text
Thing
Used on these types
ActionAccessSpecification
Invoice
Offer
PhysicalActivity
Product
Service
Sub-properties
accommodationCategory

Source

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