When you deal with genuine wholesale suppliers, you will frequently hear the term: SKU. A SKU is the unique number a wholesaler assigns to a product type. It may be a model number or a product number. If a wholesaler carries 8,000 unique products, in the industry they talk of the wholesale supplier carrying 8,000 SKU’s.
A model with three colors is likely to have three SKUs to identify the product, one SKU for each color. Note this is not a number that is unique to each product (like your Social Security Number). It is a number that is unique to each product description.
It’s as simple as that.