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

DPB

   /d*-pib'/ The PDP-10 instruction "DePosit Byte" that inserts
   some bits into the middle of some other bits.  Hackish usage
   has been kept alive by the Common LISP function of the same
   name.

   [Jargon File]

   (1994-12-07)