Source: Noto Sans Math

U+21CC Rightwards Harpoon Over Leftwards Harpoon

U+21CC was added in Unicode version 1.1 in 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 no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+21CC forms with similar adjacent characters prevents a line break inside it.

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

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
Nº	8652
UTF-8	E2 87 8C
UTF-16	21 CC
UTF-32	00 00 21 CC
URL-Quoted	%E2%87%8C
HTML hex reference	⇌
Wrong windows-1252 Mojibake	â‡Œ
HTML named entity	&Equilibrium;
HTML named entity	&rightleftharpoons;
HTML named entity	&rlhar;
Encoding: GB18030 (hex bytes)	81 36 CC 34
L^AT_EX	\rightleftharpoons

Elsewhere

Complete Record

Property	Value
Age (age)	1.1 (1993)
Unicode Name (na)	RIGHTWARDS HARPOON OVER LEFTWARDS HARPOON
Unicode 1 Name (na1)	RIGHT HARPOON OVER LEFT HARPOON
Block (blk)	Arrows
General Category (gc)	Other Symbol
Script (sc)	Common
Bidirectional Category (bc)	Other Neutral
Combining Class (ccc)	Not Reordered
Decomposition Type (dt)	none
Decomposition Mapping (dm)	Rightwards Harpoon Over Leftwards Harpoon
Lowercase (Lower)	✘
Simple Lowercase Mapping (slc)	Rightwards Harpoon Over Leftwards Harpoon
Lowercase Mapping (lc)	Rightwards Harpoon Over Leftwards Harpoon
Uppercase (Upper)	✘
Simple Uppercase Mapping (suc)	Rightwards Harpoon Over Leftwards Harpoon
Uppercase Mapping (uc)	Rightwards Harpoon Over Leftwards Harpoon
Simple Titlecase Mapping (stc)	Rightwards Harpoon Over Leftwards Harpoon
Titlecase Mapping (tc)	Rightwards Harpoon Over Leftwards Harpoon
Case Folding (cf)	Rightwards Harpoon Over Leftwards Harpoon
ASCII Hex Digit (AHex)	✘
Alphabetic (Alpha)	✘
Bidi Control (Bidi_C)	✘
Bidi Mirrored (Bidi_M)	✘
Composition Exclusion (CE)	✘
Case Ignorable (CI)	✘
Changes When Casefolded (CWCF)	✘
Changes When Casemapped (CWCM)	✘
Changes When NFKC Casefolded (CWKCF)	✘
Changes When Lowercased (CWL)	✘
Changes When Titlecased (CWT)	✘
Changes When Uppercased (CWU)	✘
Cased (Cased)	✘
Full Composition Exclusion (Comp_Ex)	✘
Default Ignorable Code Point (DI)	✘
Dash (Dash)	✘
Deprecated (Dep)	✘
Diacritic (Dia)	✘
Emoji Modifier Base (EBase)	✘
Emoji Component (EComp)	✘
Emoji Modifier (EMod)	✘
Emoji Presentation (EPres)	✘
Emoji (Emoji)	✘
Extender (Ext)	✘
Extended Pictographic (ExtPict)	✘
FC NFKC Closure (FC_NFKC)	Rightwards Harpoon Over Leftwards Harpoon
Grapheme Cluster Break (GCB)	Any
Grapheme Base (Gr_Base)	✔
Grapheme Extend (Gr_Ext)	✘
Grapheme Link (Gr_Link)	✘
Hex Digit (Hex)	✘
Hyphen (Hyphen)	✘
ID Continue (IDC)	✘
ID Start (IDS)	✘
IDS Binary Operator (IDSB)	✘
IDS Trinary Operator and (IDST)	✘
IDSU (IDSU)	0
ID_Compat_Math_Continue (ID_Compat_Math_Continue)	0
ID_Compat_Math_Start (ID_Compat_Math_Start)	0
Ideographic (Ideo)	✘
InCB (InCB)	None
Indic Mantra Category (InMC)	—
Indic Positional Category (InPC)	NA
Indic Syllabic Category (InSC)	Other
Jamo Short Name (JSN)	—
Join Control (Join_C)	✘
Logical Order Exception (LOE)	✘
Modifier Combining Mark (MCM)	✘
Math (Math)	✔
Noncharacter Code Point (NChar)	✘
NFC Quick Check (NFC_QC)	Yes
NFD Quick Check (NFD_QC)	Yes
NFKC Casefold (NFKC_CF)	Rightwards Harpoon Over Leftwards Harpoon
NFKC Quick Check (NFKC_QC)	Yes
NFKC_SCF (NFKC_SCF)	Rightwards Harpoon Over Leftwards Harpoon
NFKD Quick Check (NFKD_QC)	Yes
Other Alphabetic (OAlpha)	✘
Other Default Ignorable Code Point (ODI)	✘
Other Grapheme Extend (OGr_Ext)	✘
Other ID Continue (OIDC)	✘
Other ID Start (OIDS)	✘
Other Lowercase (OLower)	✘
Other Math (OMath)	✔
Other Uppercase (OUpper)	✘
Prepended Concatenation Mark (PCM)	✘
Pattern Syntax (Pat_Syn)	✔
Pattern White Space (Pat_WS)	✘
Quotation Mark (QMark)	✘
Regional Indicator (RI)	✘
Radical (Radical)	✘
Sentence Break (SB)	Other
Soft Dotted (SD)	✘
Sentence Terminal (STerm)	✘
Terminal Punctuation (Term)	✘
Unified Ideograph (UIdeo)	✘
Variation Selector (VS)	✘
Word Break (WB)	Other
White Space (WSpace)	✘
XID Continue (XIDC)	✘
XID Start (XIDS)	✘
Expands On NFC (XO_NFC)	✘
Expands On NFD (XO_NFD)	✘
Expands On NFKC (XO_NFKC)	✘
Expands On NFKD (XO_NFKD)	✘
Bidi Paired Bracket (bpb)	Rightwards Harpoon Over Leftwards Harpoon
Bidi Paired Bracket Type (bpt)	None
East Asian Width (ea)	neutral
Hangul Syllable Type (hst)	Not Applicable
ISO 10646 Comment (isc)	—
Joining Group (jg)	No_Joining_Group
Joining Type (jt)	Non Joining
Line Break (lb)	Alphabetic
Numeric Type (nt)	none
Numeric Value (nv)	not a number
Simple Case Folding (scf)	Rightwards Harpoon Over Leftwards Harpoon
Script Extension (scx)
Vertical Orientation (vo)	R