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Documented in Volume 1 of the UNIX Programmers Manual.
dc means "desk calculator".
See /usr/doc/dc on 4.2 BSD systems for additional online documentation on this.  

 % dc
  660
  66
  /
  p
  10
  CTRL-D
 %

  inputs 660, divides it by 66 (Polish notation) and prints the
  result (10). Terminate dc by CTRL-D.

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