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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   ELISP
      1. <language> A Lisp variant originally implemented for
      DEC-20s by Chuck Hedrick of Rutgers.
      2. <language> A common abbreviation for Emacs Lisp.  Use of
      this abbreviation is discouraged because "Elisp" is or was a
      trademark.
      [Still a trademark?  Whose?]
      (1995-04-04)