sku

from The Free On-line Dictionary of Computing (8 July 2008)

stock-keeping unit
SKU

   <database> (SKU) /skyoo/ (rarely seen expanded) A common term
   for a unique numeric identifier, typically in a {database}.
   Originally this was used only for products, but has spread in
   usage.

   Compare with {UID} for sense development.

   (1998-09-27)