V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
PLS
       Personal Library Systems (manufacturer)
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
PLS
       PhysicaL Signaling
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
PLS
       Programmable Logic Sequencer
The Free On-line Dictionary of Computing (30 December 2018):
Programming Language/Systems
PL/S
    (PL/S) An IBM machine-oriented language derived
   from PL/I, in the late 1960s, for the IBM 360 and IBM
   370.  PL/S permitted inline assembly language and control
   over register usage.
   Previous IBM 360 operating systems such as OS/MFT and
   OS/MVT had been written entirely in assembly language.
   The first IBM OS that had any significant portion written in
   PL/S was MVS, followed by OS/VS1, OS/VS2 and OS/SVS.
   PL/S was part of IBM's OCO
   (http://www.landley.net/history/mirror/ibm/oco.html) (object
   code only) effort, started in 1983.  PL/S was used internally
   and never released to the public.  It is documented in various
   IBM internal ZZ-? publications.
   Versions: PLS1, PLSII.
   ["PL/S, Programming Language/Systems", W.R. Brittenham, Proc
   GUIDE Intl, GUIDE 34, May 14, 1972, pp. 540-556].
   (2012-01-20)