:.prop describes
From FollowTheScore
This property states that a certain property can / should be used to characterise instances of the specified class.
Example: A property named 'born in' might be useful to describe instances of a class named Person.
So, in Property:Born in you would write {{.prop describes|Person}}.
Note that we use a template called .prop describes rather than a direct property assignment.
This property is assigned by .prop assigned by::Template:.prop describes