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TOPS-10:: /tops-ten/ n. DEC's proprietary OS for the fabled PDP-10
   machines, long a favorite of hackers but now effectively extinct.
   A fountain of hacker folklore; see Appendix A.  See also ITS,
   TOPS-20, TWENEX, VMS, operating system.  TOPS-10 was
   sometimes called BOTS-10 (from `bottoms-ten') as a comment on the
   inappropriateness of describing it as the top of anything.