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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   REP
      <programming> A directive used in IBM object code card
    decks (and later PTF Tapes) to REPlace fragments of already
      assembled or compiled object code prior to link edit.
      Recompiling or reassembling the source code to produce a
      whole new object module was only possible if the source code
      was available, which it rarely was (if you had the object you
      were lucky!)  It was also quicker to apply incremental changes
      with REP cards and they also circumvented the checksums and
      card sequence numbers present in the object code.
      (1998-07-16)