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

FGREP
       Fixed Global Regular Expression Print (Unix, GREP)


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

fgrep

    A variant of the Unix grep command which searches
   for fixed (uninterpreted) strings rather than regular
   expressions.  Surprisingly, this is not always faster.

   (1996-10-27)