V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CSL
       Callable Services Library (IBM, VM/ESA, CMS)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CSL
       Computer SoLutions [software gmbh] (Haendler)


The Free On-line Dictionary of Computing (30 December 2018):

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)].