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)].