UID

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

uid

   <programming, database>

   1. {user identifier}.

   2. unique identifier - of any sort, possibly following sense 1.

   Compare with {SKU} for sense-development.

   (1998-09-27)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

UID
       Unit IDentifier (cryptography, EES)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

UID
       User IDentification