| Symbol | Format | Data |
|---|---|---|
| ⇔ | Code Point |
U+21D4 |
| TeX |
\Leftrightarrow |
|
| SVG |
The left right double arrow is used in math for the “if and only if” statement. It is used as a shorter alternative to ⟺ (long left right double arrow), which is the official symbol for the “if and only if” statement. Typically the symbol is used in an expression like this.
In plain language, this means that if is true, then must be true and if is false, then must be false.
The long left right double arrow is used in math to represent the "if and only if" statement.
The symbol of an arrow pointing both left and right.
The symbol of a long arrow pointing both left and right.
The long left double arrow symbol is used in math to represent the "implied by" statement.
The long right double arrow symbol is used in math to represent the "implies" statement.