core + attic (Attic Area): these terms have been either deprecated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

numberOfItems

Canonical URL: http://schema.org/numberOfItems

Thing > Property > numberOfItems

The number of items in an ItemList. Note that some descriptions might not fully describe all items in a list (e.g., multi-page pagination); in such cases, the numberOfItems would be for the entire list.
Values expected to be one of these types
Integer
Used on these types
ItemList

Schema Version 3.4