| Symbol Name | Left Right Double Arrow |
| Unicode Version | 1.1 |
| Unicode | U+21D4 |
| Unicode block | |
| General category | Math Symbol (Sm) |
| CSS Code | \21D4 |
| Hex Code | 0x21D4 |
| HTML Code | ⇔ |
| LaTeX | \Leftrightarrow |
| Symbol | ⇔ |
| URL encode (UTF-8 percent) | %E2%87%94 |
| Spoken / screen reader name | Left Right Double Arrow |
| UTF-8 | E2 87 94 |
| UTF-16 | 21D4 |
| UTF-32 | 000021D4 |
1\documentclass{article}2\usepackage{pifont}3\Leftrightarrow 4\end{document}You can type the left right double arrow symbol on most modern devices with the help of following methods:
Alt + 8660 on Windows (numeric keypad with Num Lock), or insert via Character Map.
Edit → Emoji & Symbols, search "left right double arrow", or use Unicode Hex Input with 21D4.
Ctrl + Shift + U, type 21d4, then Enter (layout-dependent).
Paste from this page, use text replacement, or pick from the symbol keyboard.
Paste from this page or use a keyboard with math symbol support.
1span.left-right-double-arrow::before { content: "\21D4"; }1<span>⇔</span>Left Right Double Arrow symbol's representation in different programming languages can be found in the table below:
| Language | Representation |
|---|---|
| JavaScript / TypeScript | '\u21D4' or String.fromCodePoint(0x21D4) |
| Python | '\N{LEFT RIGHT DOUBLE ARROW}' or chr(8660) |
| Rust | '\u{21D4}' |
| C / C++ | UTF-8 source or wchar_t with U+21D4 |
| Go | string(rune(0x21D4)) |
| Ruby | "\u21D4" |