The Free On-line Dictionary of Computing (30 December 2018):

Storage Allocation and Coding Program

    (STAC) A symbolic macro-assembler for the
   English Electric DEUCE.

   ["DEUCE STAC Programming Manual", DEUCE News No. 38, Report
   K/AA y 1 DEUCE Library Service, Data Processing and COntrol
   Systems DIvision, English Electric Company, Kidsgrove, June].

   (1998-06-08)