Source : Free On-Line Dictionary of Computing

CSL
     
        1. Computer Structure Language.  A computer {hardware
        description language}, written in {BCPL}.
     
        ["Computer Structure Language (CSL)", Proc 1975 Symp on Comp
        Hardware Description Languages and their Appl, ACM (Sep
        1975)].
     
        2. Control and Simulation Language.  A language for industrial
        simulation from Esso and {IBM}.
     
        ["Control and Simulation Language", J.N. Buxton et al,
        Computer J 5(3):194-199 (Oct 1962).  Version: CSL 2 (1966 for
        IBM 7094)].