View source for =

{{also|Appendix:Variations of "&#61;"|二}}
{{character info}}
{{character info/var|⁼|₌|﹦|＝|🟰}}
==Translingual==
{{wikipedia}}

===Description===
Two [[parallel]] [[horizontal]] [[line]]s.

===Glyph origin===
In the modern sense as the equal sign, first attested in ''{{abbr|The Whetstone of Witte|The whetstone of witte, whiche is the seconde parte of Arithmetike: containyng thextraction of Rootes: The Coßike practise, with the rule of Equation: and the woorkes of Surde Nombers}}'' (1557) by Welsh mathematician {{w|Robert Recorde}}, in which the two parallel lines expressed equality, because, as Recorde wrote, "''bicauſe noe .2. thynges, can be moare equalle''" ("because no two things can be more equal").

===Symbol===
{{head|mul|symbol}}

# {{lb|mul|math}} The [[equal]] sign. It asserts that two quantities or [[expression]]s have the same [[value]].
#: ''2+2'''='''4''
## {{lb|mul|math|computing theory|[[abuse of notation]]|with [[big O notation]]}} [[is|Is]]. Used to state the [[relation]] that the growth rate of the expression on the left side of the sign is [[bounded]] or [[limited]] by that of the expression on the right.
##: {{syn|mul|∈|⊂|⊆}} {{small|(depending on context)}}
##: ''The statement <math>f(x)=O(log^2 x)</math> means that as <math>x</math> gets arbitrarily large, <math>f(x)</math> will never grow faster than some constant multiple of <math>log^2 x</math>.''
# {{lb|mul|chemistry}} A double [[bond]]; a chemical bond between two chemical [[element]]s involving four bonding [[electron]]s instead of the usual [[two]].
# {{lb|mul|programming}} The [[assignment]] operator. It assigns a value to a [[variable]].
#: ''$price'''='''18.95'' (this causes $price to be 18.95 from now on)
# {{lb|mul|programming}} An operator that [[compare]]s if two values are [[equal]]. In some languages, [[==]] is used instead.
# {{lb|mul|lexicography}} The same form as the headword.
#: ''sheep pl. '''='''''
# {{lb|mul|lexicography}} {{non-gloss|Indicates [[synonyms]] of a word.}}
# {{lb|mul|linguistics}} {{n-g|Indicates a [[clitic]] boundary.}}
# (''Chinese [[wikipedia:Chinese_bronze_inscriptions|bronze script]])'' A [[wikipedia:Ditto_mark|ditto mark]].

====Usage notes====
When used in big O notation, the ''='' relation is [[asymmetric]] i.e. <math>O(x)=O(x^2)</math> is ''not'' equivalent to <math>O(x^2)=O(x)</math>. For a wider discussion on this usage, refer to [[:w:Big O notation#Matters of notation|this English Wikipedia article]].

====Quotations====
{{seeCites|mul}}

====Synonyms====
* {{sense|assignment}} {{l|mul|\:{{=}}}}, {{l|mul|≔}}, {{l|mul|←}}
* {{sense|compares if equal}} {{l|mul|{{=}}{{=}}}}, {{l|mul|⩵}}

====Antonyms====
* {{antsense|equals}} {{l|mul|≠}}

====Derived terms====
{{col|mul
|!&#61;
|≠
|≗
|≘
|≙
|≚
|≛
|≜
|≝
|≞
|≟
|≡
|⩰
}}

===Conjunction===
{{head|mul|conjunction}}

# {{lb|mul|informal}} The [[same]] as; [[equal]] to.
#: {{ux|mul|2=A wireless keyboard '''=''' a keyboard without a wire.}}
#: {{ux|mul|2=Vulpes vulpes '''=''' red fox.}}

====Quotations====
{{seeCites|mul}}

====Antonyms====
* {{antsense|equals}} {{l|mul|≠}}

===See also===
{{col|mul
|-
|[[~]]
}}
{{col|mul|title=Related symbols from U+2242–U+2269
|≂
|≃
|≄
|≅
|≆
|≇
|≈
|≉
|≊
|≋
|≌
|≍
|≎
|≏
|≐
|≑
|≒
|≓
|≔
|≕
|≖
|≗
|≘
|≙
|≚
|≛
|≜
|≝
|≞
|≟
|≠
|≡
|≢
|≣
|≤
|≥
|≦
|≧
|≨
|≩
}}

==Japanese==

===Particle===
{{ja-pos|particle|イコール}}

# {{lb|ja|informal}} {{alt form of|ja|イコール|tr=ikōru||equals, is equal to}}

===Symbol===
{{ja-pos|symbol}}

# {{alternative form of|ja|゠}}

==Latin==

===Symbol===
{{head|la|symbol}}

# Symbol for '''[[sextans]]'''.