Editing Equals sign (section)

==Related symbols==
{{See also|Unicode mathematical operators}}

===Approximately equal===
{{Main|Approximation#Typography}}

Symbols used to denote items that are ''[[approximately equal]]'' include the following:<ref name = "The Unicode Consortium">{{cite web | title = Mathematical Operators | website = Unicode.org | url = https://www.unicode.org/charts/PDF/U2200.pdf | access-date = 19 October 2013 | archive-date = 12 June 2018 | archive-url = https://web.archive.org/web/20180612210306/http://www.unicode.org/charts/PDF/U2200.pdf | url-status = live }}</ref>
* <span style="font-size: 200%;line-height:50%;">≈</span> ({{unichar|2248|almost equal to}}, [[LaTeX]] ''\approx'')
* <span style="font-size: 150%;line-height:50%">≃</span> ({{unichar|2243|asymptotically equal to|nlink=Asymptotic analysis}}, LaTeX ''\simeq''), a combination of {{char|≈}} and {{char|{{=}}}}, also used to indicate [[Asymptotic analysis|asymptotic equality]]
* <span style="font-size: 150%;line-height:50%">≅</span> ({{unichar|2245|approximately equal to}}, LaTeX ''\cong''), another combination of ≈ and =, which is also sometimes used to indicate [[isomorphism]] or [[Congruence relation|congruence]]
* <span style="font-size: 150%;line-height:50%">{{not a typo|∼}}</span> ({{unichar|223C|tilde operator|nlink=Tilde#Mathematics}}, LaTeX ''\sim''), which is also sometimes used to indicate [[proportionality (mathematics)|proportionality]] or [[similarity (geometry)|similarity]], being related by an [[equivalence relation]], or to indicate that a [[random variable]] is distributed according to a specific [[probability distribution]] (see also [[tilde]]), or alternatively between two quantities to indicate they are of the same [[order of magnitude]].
* <span style="font-size: 150%;line-height:50%">∽</span> ({{unichar|223D|reversed tilde}}, LaTeX ''\backsim''), which is also used to indicate [[proportionality (mathematics)|proportionality]]
* <span style="font-size: 150%;line-height:50%">≐</span> ({{unichar|2250|approaches the limit}}, LaTeX ''\doteq''), which can also be used to represent the approach of a variable to a [[Limit (mathematics)|limit]]
* <span style="font-size: 150%;line-height:50%">≒</span> ({{unichar|2252|Approximately equal to or the image of}}, LaTeX ''\fallingdotseq''), commonly used in Japan, Taiwan, and Korea.
* <span style="font-size: 150%;line-height:50%">≓</span> ({{unichar|2253|image of or approximately equal to}}, LaTeX ''\risingdotseq'')

In some areas of East Asia, such as Japan, "≒" is used to mean "the two terms are almost equal", but in other areas and specialized literature such as mathematics, "≃" is often used. In addition to its mathematical meaning, it is sometimes used in Japanese sentences with the intention of "almost the same".

===Not equal===
The symbol used to denote [[inequation]] (when items are not equal) is a [[Slash (punctuation)|slashed]] equal sign {{char|≠}} (U+2260). In [[LaTeX]], this is done with the "\neq" command.

Most programming languages, limiting themselves to the [[ASCII|7-bit ASCII]] [[character set]] and [[QWERTY|typeable characters]], use {{code|1=~=}}, {{code|1=!=}}, {{code|1=/=}}, or {{code|<>}} to represent their [[Boolean logic|Boolean]] [[inequality operator]].

===Identity===
The [[triple bar]] symbol {{char|≡}} (U+2261, LaTeX ''\equiv'') is often used to indicate an [[identity (mathematics)|identity]], a [[definition]] (which can also be represented by {{unichar|225D|equal to by definition}}  or {{unichar|2254|Colon equals}}), or a [[congruence relation]] in [[modular arithmetic]]. Also, in [[chemistry]], the triple bar can be used to represent a [[triple bond]] between atoms.

===Isomorphism===
The symbol {{char|≅}} is often used to indicate [[isomorphic]] algebraic structures or [[Congruence (geometry)|congruent]] geometric figures.

===In logic===
Equality of [[truth value]]s (through [[bi-implication]] or [[logical equivalence]]), may be denoted by various symbols including {{char|1==}}, {{char|~}}, and {{char|⇔}}.
===In geometry===
The symbol <math>\bumpeq </math> (LaTeX \bumpeq) is used to show two directed line segments have the same length and direction, [[equipollence (geometry)|equipollence]].

===Other related symbols <span class="anchor" id="Delta equal to"></span>===
Additional [[precomposed character|precomposed symbols]] with [[code point]]s in Unicode for notations related to the equal sign include the following:<ref name="The Unicode Consortium"/>

* <span style="font-size: 150%;line-height:50%;">≌</span> ({{unichar|224C|ALL EQUAL TO}})
* <span style="font-size: 150%;line-height:50%;">≔</span> ({{unichar|2254|COLON EQUALS}}) ([[Glossary of mathematical symbols#Equality, equivalence and similarity|used to define a symbol]] or [[assignment (computer science)|assign a variable]])
* <span style="font-size: 150%;line-height:50%;">≕</span> ({{unichar|2255|EQUALS COLON}}) (defines the symbol on the right-hand side)
* <span style="font-size: 150%;line-height:50%;">≖</span> ({{unichar|2256|RING IN EQUAL TO}})
* <span style="font-size: 150%;line-height:50%;">≗</span> ({{unichar|2257|RING EQUAL TO}})
<!-- U+2258 is mentioned already in the section "Identity" above. -->
* <span style="font-size: 150%;line-height:50%;">≘</span> ({{unichar|2258|CORRESPONDS TO}})
* <span style="font-size: 150%;line-height:50%;">≙</span> ({{unichar|2259|ESTIMATES}}) (the left-hand side is an [[estimator]] for the right-hand side)
* <span style="font-size: 150%;line-height:50%;">≚</span> ({{unichar|225A|EQUIANGULAR TO}})
* <span style="font-size: 150%;line-height:50%;">≛</span> ({{unichar|225B|STAR EQUALS}})
* <span style="font-size: 150%;line-height:50%;">≜</span> ({{unichar|225C|DELTA EQUAL TO}}) ([[Glossary of mathematical symbols#Equality, equivalence and similarity|used to define a symbol]])
<!-- U+225D is mentioned already in the section "Identity" above. -->
* <span style="font-size: 150%;line-height:50%;">≞</span> ({{unichar|225E|MEASURED BY}})
* <span style="font-size: 150%;line-height:50%;">≟</span> ({{unichar|225F|QUESTIONED EQUAL TO}})
* <span style="font-size: 150%;line-height:50%;">⩴</span> ({{unichar|2A74|DOUBLE COLON EQUAL}}) (see also [[Backus–Naur form]] for {{code|1=::=}})
* <span style="font-size: 150%;line-height:50%;">⩵</span> ({{unichar|2A75|TWO CONSECUTIVE EQUALS SIGNS}})
* <span style="font-size: 150%;line-height:50%;">⩶</span> ({{unichar|2A76|THREE CONSECUTIVE EQUALS SIGNS}})