DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   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)