Home U+2190 to U+21FF Arrows
Glyph for U+21CB
Source: Noto Sans Math

U+21CB LEFTWARDS HARPOON OVER RIGHTWARDS HARPOON

U+21CB was added to Unicode in version 1.1 (1993). It belongs to the block U+2190 to U+21FF Arrows in the U+0000 to U+FFFF Basic Multilingual Plane.

This character is a Other Symbol and is commonly used, that is, in no specific script.

The glyph is not a composition. It has a Neutral East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. In text U+21CB behaves as Alphabetic regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.

The CLDR project labels this character “leftwards harpoon over rightwards harpoon” for use in screen reading software. It assigns additional tags, e.g. for search in emoji pickers: leftwards harpoon over rightwards harpoon.

The Wikipedia has the following information about this codepoint:

In a chemical reaction, chemical equilibrium is the state in which both the reactants and products are present in concentrations which have no further tendency to change with time, so that there is no observable change in the properties of the system. This state results when the forward reaction proceeds at the same rate as the reverse reaction. The reaction rates of the forward and backward reactions are generally not zero, but they are equal. Thus, there are no net changes in the concentrations of the reactants and products. Such a state is known as dynamic equilibrium.

Representations

System Representation
8651
UTF-8 E2 87 8B
UTF-16 21 CB
UTF-32 00 00 21 CB
URL-Quoted %E2%87%8B
HTML-Escape ⇋
Wrong windows-1252 Mojibake ⇋
HTML-Escape ⇋
HTML-Escape ⇋
HTML-Escape ⇋
LATEX \leftrightharpoons

Elsewhere

Complete Record

Property Value
Age 1.1 (1993)
Unicode Name LEFTWARDS HARPOON OVER RIGHTWARDS HARPOON
Unicode 1 Name LEFT HARPOON OVER RIGHT HARPOON
Block Arrows
General Category Other Symbol
Script Common
Bidirectional Category Other Neutral
Combining Class Not Reordered
Decomposition Type None
Decomposition Mapping Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Lowercase
Simple Lowercase Mapping Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Lowercase Mapping Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Uppercase
Simple Uppercase Mapping Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Uppercase Mapping Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Simple Titlecase Mapping Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Titlecase Mapping Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Case Folding Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
ASCII Hex Digit
Alphabetic
Bidi Control
Bidi Mirrored
Bidi Paired Bracket Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Bidi Paired Bracket Type None
Cased
Composition Exclusion
Case Ignorable
Full Composition Exclusion
Changes When Casefolded
Changes When Casemapped
Changes When NFKC Casefolded
Changes When Lowercased
Changes When Titlecased
Changes When Uppercased
Dash
Deprecated
Default Ignorable Code Point
Diacritic
East Asian Width Neutral
Emoji Modifier Base
Emoji Component
Emoji Modifier
Emoji
Emoji Presentation
Extender
Extended Pictographic
FC NFKC Closure Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Grapheme Cluster Break Any
Grapheme Base
Grapheme Extend
Grapheme Link
Hex Digit
Hangul Syllable Type Not Applicable
Hyphen
ID Continue
Ideographic
ID Start
IDS Binary Operator
IDS Trinary Operator and
Indic Mantra Category
Indic Positional Category NA
Indic Syllabic Category Other
ISO 10646 Comment
Joining Group No_Joining_Group
Join Control
Jamo Short Name
Joining Type Non Joining
Line Break Alphabetic
Logical Order Exception
Math
Noncharacter Code Point
NFC Quick Check Yes
NFD Quick Check Yes
NFKC Casefold Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
NFKC Quick Check Yes
NFKD Quick Check Yes
Numeric Type None
Numeric Value not a number
Other Alphabetic
Other Default Ignorable Code Point
Other Grapheme Extend
Other ID Continue
Other ID Start
Other Lowercase
Other Math
Other Uppercase
Pattern Syntax
Pattern White Space
Prepended Concatenation Mark
Quotation Mark
Radical
Regional Indicator
Sentence Break Other
Simple Case Folding Glyph for U+21CB Leftwards Harpoon Over Rightwards Harpoon
Script Extension
Soft Dotted
Sentence Terminal
Terminal Punctuation
Unified Ideograph
Vertical Orientation R
Variation Selector
Word Break Other
White Space
XID Continue
XID Start
Expands On NFC
Expands On NFD
Expands On NFKC
Expands On NFKD