noun
item number; product ID; reference number
Used in retail, inventory, and catalog contexts to refer to a unique identifier assigned to a product or item.
カタログで商品番号を確認してください。
Please check the item number in the catalog.
注文の際は商品番号をお知らせください。
Please provide the product ID when ordering.
品番 is a common abbreviation of 商品番号, used in similar contexts but slightly more casual and often seen in internal business communication.
Compound of 商品 (product, merchandise) and 番号 (number). The exact historical derivation is straightforward; the word is a modern technical term.