control-s

Free On-line Dictionary of Computing

<character> (XOFF, DC3, Device Control 3, ASCII code 19). A character used in software handshaking to temporarily suspend output until a control-Q is received. [Jargon File]

(1996-06-28)

The Jargon File

“Stop talking for a second.” From the ASCII DC3 or XOFF character (the pronunciation /X-of/ is therefore also used). Control-S differs from control-O in that the person is asked to stop talking (perhaps because you are on the phone) but will be allowed to continue when you're ready to listen to him — as opposed to control-O, which has more of the meaning of “ Shut up.” Considered silly.