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

sku

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

Thing > Property > identifier > sku

The Stock Keeping Unit (SKU), i.e. a merchant-specific identifier for a product or service, or the product to which the offer refers.

Usage: Between 250,000 and 500,000 domains
Values expected to be one of these types
Text
Used on these types
Demand
Offer
Product
Super-properties
identifier

Acknowledgement

This term uses terminology from the GoodRelations Vocabulary for E-Commerce, created by Martin Hepp. GoodRelations is a data model for sharing e-commerce data on the Web. More information about GoodRelations can be found at http://purl.org/goodrelations/.

Schema Version 3.3