What does SKU stands for?

SKU stands for Stock Keeping Unit

SKU refers to a stock-keeping unit, a unique identifier for each distinct product and service that can be purchased in business.

Addition info:- You can get the list of all SKU at:-

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319\SKUs

SKU (stockkeeping unit) is an identification, usually alphanumeric, of a particular product that allows it to be tracked for inventory purposes. Typically, an SKU is associated with any purchasable item in a store or catalog. For example, a woman's blouse of a particular style and size might have an SKU of "3736-9," meaning "Style 3736, size 9." The SKU identification for a product may or may not be made visible to a customer. SKU numbers can sometimes be seen in online e-commerce sites.