Translingual
Description
Two parallel horizontal lines .
Symbol
=
( mathematics ) equal sign. It asserts that two quantities or expressions have the same value .
2+2= 4 ( mathematics , computing theory , abuse of notation , with big O notation ) Is . Used to state the relation that the expression on the left side of the sign is at most as large as the expression on the right.
Synonyms: ∈ ⊂ ⊆ (depending on context) The statement
f
(
x
)
=
O
(
l
o
g
2
x
)
{\displaystyle f(x)=O(log^{2}x)}
x
{\displaystyle x}
f
(
x
)
{\displaystyle f(x)}
l
o
g
2
x
{\displaystyle log^{2}x}
( chemistry ) bond ; a chemical bond between two chemical elements involving four bonding electrons instead of the usual two .( programming ) assignment operator. It assigns a value to a variable .
$price= 18.95 (this causes $price to be 18.95 from now on)( programming ) compares if two values are equal . In some languages, == is used instead.( lexicography ) sheep pl. = ( lexicography ) Indicates synonyms of a word. ( Hittitology ) Indicates morpheme boundaries in bound transcription of Hittite terms with clitics .
Usage notes
When used in big O notation, the = relation is asymmetric i.e.
O
(
x
)
=
O
(
x
2
)
{\displaystyle O(x)=O(x^{2})}
not equivalent to
O
(
x
2
)
=
O
(
x
)
{\displaystyle O(x^{2})=O(x)}
this English Wikipedia article .
Quotations
For quotations using this term, see Citations:= .
Synonyms
( assignment ) : := ≔ ← ( compares if equal ) : == ⩵
Antonyms
Derived terms
Conjunction
=
( informal ) 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
See also
Related symbols from U+2242–U+2269
Japanese
Symbol
=
Alternative form of ゠
Latin
Symbol
=
symbol for sextans 
