U+0005 "ENQ" ENQUIRY Unicode Character

U+0005 "ENQ" ENQUIRY is a control character originally defined in the ASCII standard for data transmission, used to request a response from a remote station or device. It belongs to the C0 control code set and is typically sent by a master station to ask a slave station if it is ready to receive data or to confirm its identity. Historically, ENQ was part of communication protocols in teletypewriters and early computer networks, functioning as a handshake signal that expected an acknowledge (ACK) or negative acknowledge (NAK) reply. Today, it is rarely used in modern computing, though it remains defined in Unicode for the sake of compatibility with legacy systems and data formats.

General Properties

Code Point	U+0005
Version Added	1.1
Unicode 1.0 Name	Enquiry
Block	Basic Latin
General Category	Control
Canonical Combining Class	Not Reordered
Bidirectional Class	Boundary Neutral
Alias	ENQ (abbreviation) ENQUIRY (control)

Encodings

HTML Decimal Encoding	
HTML Hex Encoding	
UTF-8 Encoding	0x05
UTF-16 Encoding	0x0005
UTF-32 Encoding	0x00000005
C/C++/Java Escape	\u0005

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