Control-O

<character> ASCII character 15 (SI).

The character used on some operating systems to abort output but allow the program to keep on running.

The name "SI" comes from its use on some terminals to "shift in" an alternative character set.

"SO" is Control-N.

Compare control-S.

[Jargon File]

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control code control flow control-G Control Language controller	ASCII character table control code Shift In	Control Program Control Program for Microcomputers control-Q control-S control structure