Organisations often create their own stock keeping unit (SKU) numbering system, which may or may not have a meaningful structure. Stock keeping unit is a number that is assigned to a product for the purpose of inventory management and is of tracking. In other words, a stock keeping unit is a unique identifier assigned to each product for easier and more efficient record keeping.
An FDA (US Food and Drug Administration) product code describes a specific product and contains a combination of five to seven numbers and letters. The product code submitted with each FDA line item should match the actual product name and/or invoice description of the product.
The International Standard Book Number is a numeric commercial book identifier which is in-tended to be unique. Publishers purchase ISBNs from an affiliate of the International ISBN Agency.
The Harmonized Commodity Description and Coding System, also known as the Harmonized System (HS) of tariff nomenclature is an internationally standardized system of names and numbers to classify traded products.