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)].