WordNet (r) 3.0 (2006):

prep
    n 1: preparatory school work done outside school (especially at
         home) [syn: homework, prep, preparation]

The Free On-line Dictionary of Computing (19 January 2023):

PREP

   1. (PReP) PowerPC Reference Platform.

   2. (PREP) PRogrammed Electronics Patterns.  Language for
   designing integrated circuits.  ["Computer Assisted Mask
   Production", R.L. Rosenfeld, Proc IEEE 57(9) Sep 1969].