pdl

pdl /pid'l/ or /puhd'l/ n.  [abbreviation for `Push Down
   List'] 1. In ITS days, the preferred MITism for {stack}.  See
   {overflow pdl}.  2. Dave Lebling, one of the co-authors of
   {Zork}; (his {network address} on the ITS machines was at one
   time pdl@dms).  3. Rarely, any sense of {PDL}, as these are not
   invariably capitalized.