WordNet (r) 3.0 (2006):

clx
    adj 1: being ten more than one hundred fifty [syn: one hundred
           sixty, 160, clx]

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

CLX
       Class Library for cross platform (Delphi, Windows, Linux)


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

CLX

    The Common Lisp library providing a
   low-level interface to the X Window System, equivalent to
   Xlib.  Graphics toolkits can be built on top of CLX,
   e.g. McCLIM, Garnet, CLUE and CLIO.  Various LISP
   implementors have independently ported CLX to their own
   platforms, fixing bugs and, in some cases, adding features
   in the process.

   CLX Wiki (http://cliki.net/CLX).

   (2004-08-27)