U+0011 "DC1" DEVICE CONTROL ONE Unicode Character

U+0011 "DC1" DEVICE CONTROL ONE is one of 32 non printing control characters defined in the C0 control code set, originally derived from ASCII standard 1963. It was designed as a transmission control character to turn on or resume a specific peripheral device, such as a printer or tape reader, in a system of multiple devices where each could be individually addressed by its own control code. In modern computing, DC1 is most commonly associated with the XON signal in software flow control, used together with DC3 XOFF to manage data transmission rates and prevent buffer overflow in serial communication, where sending DC1 tells the sender to resume transmitting data.

General Properties

Code Point	U+0011
Version Added	1.1
Unicode 1.0 Name	Device Control One
Block	Basic Latin
General Category	Control
Canonical Combining Class	Not Reordered
Bidirectional Class	Boundary Neutral
Alias	DC1 (abbreviation) DEVICE CONTROL ONE (control)

Encodings

HTML Decimal Encoding	
HTML Hex Encoding	
UTF-8 Encoding	0x11
UTF-16 Encoding	0x0011
UTF-32 Encoding	0x00000011
C/C++/Java Escape	\u0011

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
NFKC Quick Check	Yes
NFKD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Combining Mark
Script	Common
Script Extensions	Common
Indic Syllabic Category	Other
Vertical Orientation	Rotated
Grapheme Cluster Break	Control
Word Break	Other
Sentence Break	Other