A Stock Keeping Unit (SKU) is a machine-readable bar code that’s most often seen printed on product labels, that lets vendors expeditiously scan and track the movement of inventory. Typically an alphanumeric combination of eight-or-so characters SKUs may also be applied to intangible but billable products, such as units of repair time or warranties. Throughout the WordPress ecosystem, this is a popular term used in WooCommerce.

WooCommerce SKU