xoff

from Jargon File (4.4.4, 14 Aug 2003)

XOFF
 /X.of/, n.

   Syn. {control-S}.

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

control-S
XOFF

   <character> (Or XOFF, DC3, {Device Control} 3) The character
   with {ASCII} code 19, used in {software handshaking} to
   temporarily suspend output until a {control-Q} is received.

   [{Jargon File}]

   (1996-06-28)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

XOFF
       eXchange OFF (MODEM)