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from The Free On-line Dictionary of Computing (8 July 2008)

control-C
End Of Text
ETX

   <character> (Or ETX, End of Text) The {ASCII} character with
   code 3.

   Control-C is the interrupt character used on many {operating
   systems}, including {Unix} and {MS-DOS} to abort a running
   program.

   Among {BSD} {Unix} hackers, the canonical humorous response
   to "Give me a break!" is "Control C".

   [{Jargon File}]

   (1995-03-16)