⇕

Up Down Double Arrow

Unicode
U+21D5
Category
Arrows
HTML Entity
⇕
CSS
\21D5
The Up Down Double Arrow (⇕) is a bidirectional, double-lined vertical arrow found in the Unicode Arrows block. It is frequently used in mathematics and chemistry to represent reversible reactions, vertical equivalence, or two-way relationships. In digital interfaces, it often indicates vertical resizing or scrolling capabilities.

How to Type

Windows
Alt+8661 or Win+. then search 'Up Down Double Arrow'
macOS
Control+Command+Space then search 'Up Down Double Arrow'
Linux
Ctrl+Shift+U then type 21D5
HTML
⇕ or ⇕

In Programming

In technical writing and LaTeX, this symbol is generated using the `\Updownarrow` command to denote mathematical equivalence, vertical vectors, or reversible states.

Read full meaning article

Tags

U+21D5 arrow bidirectional arrow direction double resize cursor reversible reaction two-way vertical up down up down double arrow vertical vertical double arrow vertical equivalence

Related Symbols

← Left Arrow ↑ Up Arrow → Right Arrow ↓ Down Arrow ↔ Left Right Arrow ↕ Up Down Arrow ↖ North West Arrow ↗ North East Arrow ↘ South East Arrow ↙ South West Arrow ↞ Left Two Headed Arrow ↠ Right Two Headed Arrow