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)].