In
computing and
telecommunication, a control
character or non-printing character is a
code point (a
number) in a
character set that does not in itself represent a written symbol. All entries in the
ASCII table below code 32 (technically the
C0 control code set) and 127 are of this kind, including BEL (which is intended to cause an audible signal in the receiving terminal), SYN (which is a synchronization signal), and ENQ (a signal that is intended to trigger a response at the receiving end, to see if it is still present). The
EBCDIC character set contains 65 control codes, including all of the ASCII control codes as well as additional codes which are mostly used to control IBM peripherals. The
Unicode standard has added many new non-printing characters, for example the
Zero-width non-joiner. The remainder of this article covers control codes in general and some codes that are in common use. For detailed tables of the
C0 and C1 control codes used in ASCII and
ISO-8859-n, please see their respective articles.
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A
character that initiates, modifies, or stops a function,
event,
operation, or
control operation. (
188 ) Note: Control characters may be recorded for use in subsequent actions. They are not graphic characters but may have a graphic representation in some circumstances.
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