U+23A9 "⎩" Left Curly Bracket Lower Hook Unicode Character

Unicode Version 17.0

U+23A9 "⎩" Left Curly Bracket Lower Hook is a typographic symbol used primarily in mathematical notation and computer science to represent the lower portion of a vertically extended left curly brace, often employed in piecewise functions, set definitions, or branching structures where a tall brace is constructed from multiple connected glyphs. Unlike the standard opening curly brace which is a single character, this hook is part of the "Miscellaneous Technical" Unicode block and functions as a building block for displaying large braces in plain text environments, where it pairs with the Upper Hook (U+23A8) and Middle Piece (U+23A7) to form a seamless vertical bracket. Its visual design resembles a small, upturned corner or a final curved segment that completes the brace's lower left curve without extending vertically, making it distinct from broader punctuation marks. This character can be found in legacy computing systems, terminal emulators, and specialized formatting for equations,

General Properties

Code Point U+23A9
Version Added 3.2
Name Left Curly Bracket Lower Hook
Block Miscellaneous Technical
General Category Math Symbol
Canonical Combining Class Not Reordered
Bidirectional Class Other Neutral

Encodings

HTML Decimal Encoding ⎩
HTML Hex Encoding ⎩
UTF-8 Encoding 0xE2 0x8E 0xA9
UTF-16 Encoding 0x23A9
UTF-32 Encoding 0x000023A9
C/C++/Java Escape \u23a9

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 Alphabetic
Script Common
Script Extensions Common
Indic Syllabic Category Other
Pattern Syntax Yes
Math Yes
Vertical Orientation Rotated
Grapheme Base Yes
Grapheme Cluster Break Other
Word Break Other
Sentence Break Other