WordNet (r) 3.0 (2006):

PS
    n 1: a note appended to a letter after the signature [syn:
         postscript, PS]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "PS":
   Parthian shot, addendum, afterthought, appendix, back matter,
   chorus, coda, codicil, colophon, conclusion, consequence,
   continuance, continuation, double take, dying words, envoi,
   epilogue, follow-through, follow-up, last words, parting shot,
   peroration, postface, postfix, postlude, postscript, refrain,
   second thought, sequel, sequela, sequelae, sequelant, sequent,
   sequitur, subscript, suffix, supplement, swan song, tag



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

PS
       Port Selector (SATA)


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

PS
       PostScript (Adobe, PDL, printing)


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

PS
       Power Supply


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

PS
       PowerShell (MS, Windows)


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

PS
       Process Status (Unix)


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

PS
       Privilege Service (DCE)


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

PS

   1.  PostScript.

   2.  Physical Sequential.