U+0081 "HOP" Latin-1 Supplement Unicode Character

U+0081 "HOP" Latin-1 Supplement is a control code that does not represent a visible glyph or printable symbol. Instead, it is defined within the C1 control character set, specifically as "HIGH OCTET PRESET" (abbreviated as HOP), and was historically used in telecommunication and data transmission protocols to indicate that the following bytes should be interpreted using a higher-level character encoding. In modern contexts, this character is almost never encountered in typical text processing, as it serves no practical purpose in standard Unicode text and is generally considered obsolete or reserved for legacy systems.

General Properties

Code Point	U+0081
Version Added	1.1
Block	Latin-1 Supplement
General Category	Control
Canonical Combining Class	Not Reordered
Bidirectional Class	Boundary Neutral
Alias	HIGH OCTET PRESET (figment) HOP (abbreviation)

Encodings

HTML Decimal Encoding	
HTML Hex Encoding	
UTF-8 Encoding	0xC2 0x81
UTF-16 Encoding	0x0081
UTF-32 Encoding	0x00000081
C/C++/Java Escape	\u0081

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