Source : Free On-Line Dictionary of Computing

Special Interest Group
     
        (SIG) One of several technical areas, sponsored by the
        {Association for Computing Machinery}.  Well-known SIGs
        include SIGPLAN (the Special Interest Group on Programming
        Languages), SIGARCH (the Special Interest Group for Computer
        Architecture) and SIGGRAPH (the Special Interest Group for
        Computer Graphics).
     
        (1994-10-27)