=

=

See also: Appendix:Variations of "=" and 二

= U+003D, &#61; EQUALS SIGN ← < [U+003C] Basic Latin > → [U+003E]

﹦ U+FE66, ﹦ SMALL EQUALS SIGN [unassigned: U+FE67] ← ﹥ [U+FE65] Small Form Variants ﹨ → [U+FE68]

⁼ U+207C, ⁼ SUPERSCRIPT EQUALS SIGN ← ⁻ [U+207B] Superscripts and Subscripts ⁽ → [U+207D]

＝ U+FF1D, ＝ FULLWIDTH EQUALS SIGN ← ＜ [U+FF1C] Halfwidth and Fullwidth Forms ＞ → [U+FF1E]

Translingual

Description

Two parallel horizontal lines.

Symbol

=

1. (mathematics) The equal sign. It asserts that two quantities or expressions have the same value.

   2+2=4

   1. (mathematics, computing theory, abuse of notation, with big O notation) 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.

      Synonyms: ∈, ⊂, ⊆ (depending on context)

      The statement ${\\displaystyle f(x)=O(log^{2}x)}$ means that as ${\\displaystyle x}$ gets arbitrarily large, ${\\displaystyle f(x)}$ will never grow faster than some constant multiple of ${\\displaystyle log^{2}x}$.

2. (chemistry) A double bond; a chemical bond between two chemical elements involving four bonding electrons instead of the usual two.
3. (programming) The assignment operator. It assigns a value to a variable.

   $price=18.95 (this causes $price to be 18.95 from now on)

4. (programming) An operator that compares if two values are equal. In some languages, == is used instead.
5. (lexicography) The same form as the headword.

   sheep pl. =

6. (lexicography) Indicates synonyms of a word.
7. (Hittitology) Indicates morpheme boundaries in bound transcription of Hittite terms with clitics.
8. (Chinese bronze script) A ditto mark.

Usage notes

When used in big O notation, the = relation is asymmetric i.e. ${\\displaystyle O(x)=O(x^{2})}$ is not equivalent to ${\\displaystyle O(x^{2})=O(x)}$. For a wider discussion on this usage, refer to this English Wikipedia article.

Quotations

For quotations using this term, see Citations:=.

Synonyms

• (assignment): =, ≔, ←
• (compares if equal): ==, ⩵

Antonyms

• (equals): ≠

Derived terms

• !=
• ≠
• ≗
• ≘
• ≙
• ≚
• ≛
• ≜
• ≝
• ≞
• ≟

Conjunction

=

1. (informal) The same as; equal to.

   A wireless keyboard = a keyboard without a wire.

   Vulpes vulpes = red fox.

Quotations

For quotations using this term, see Citations:=.

Antonyms

• (equals): ≠

See also

• -
• ~

Related symbols from U+2242–U+2269

• ≂
• ≃
• ≄
• ≅
• ≆
• ≇
• ≈
• ≉
• ≊
• ≋
• ≌
• ≍
• ≎
• ≏
• ≐
• ≑
• ≒
• ≓
• ≔
• ≕
• ≖
• ≗
• ≘
• ≙
• ≚
• ≛
• ≜
• ≝
• ≞
• ≟
• ≠
• ≡
• ≢
• ≣
• ≤
• ≥
• ≦
• ≧
• ≨
• ≩

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Japanese

Symbol

=

1. Alternative form of ゠

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Latin

Symbol

=

1. Symbol for sextans.