A unique number assigned sequentially to items for identification or tracking.
A serial number is stamped on the product.
We manage products by serial number.
Common loanword for 'serial number', often used in computing and product registration. 一貫番号 is a native Japanese term with the same meaning but less common in everyday speech.
Compound of 一貫 (いっかん, 'consistency' or 'throughout') and 番号 (ばんごう, 'number'). The exact historical derivation is uncertain; the spelling is conventionally associated with sequential numbering.