⇔

Left Right Double Arrow

U+21D4

Quick Reference
Unicode
U+21D4
HTML Entity
⇔
HTML Numeric
⇔
CSS
\21D4
JavaScript
\u21D4
About Left Right Double Arrow

The left-right double arrow represents logical equivalence: 'if and only if'.

Usage

Used in logic for biconditional statements (P ⇔ Q means 'P if and only if Q'). Also called 'iff' in mathematics.

Related Symbols
⇒Rightwards Double Arrow→Rightwards Arrow↔Left Right Arrow
Analyze ⇔ in Symbol Spotter