control-O

( vi.)

   "Stop  talking." From the character used on some operating systems to
   abort  output  but  allow  the  program to keep on running. Generally
   means  that you are not interested in hearing anything more from that
   person, at least on that topic; a standard response to someone who is
   flaming. Considered silly. Compare {control-S}.

[glossary]
[Reference(s) to this entry by made by: {control-S}]