Long Left Right Double Arrow Symbol

Symbol Format Data
Code Point
U+27FA
TeX
\iff
SVG
All symbols

Usage

The if-and-only-if symbol is used as a logical statement in math. Typically the symbol is used in an expression like:

In plain language, this means that if is true, then must be true and if is false, then must be false.

Related

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Long left right arrow symbol.

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Long left double arrow symbol.

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The long right double arrow symbol denotes logical implication in math.