Left right double arrow

Meaning and uses

A double arrow pointing both ways. In logic it means if and only if, and in notes it marks two things that depend on each other.

Unicode details

⇔ is the Unicode character named LEFT RIGHT DOUBLE ARROW, code point U+21D4, in the Arrows block. It was added in Unicode 1.1 in 1993, and Unicode classes it as a maths symbol (general category Sm).

It is not an emoji, so it keeps the colour and size of the text around it.

Tap a code to copy it:

How to type ⇔

• On any device, tap the copy button above, then paste with a long press on a phone, Ctrl+V on Windows or Cmd+V on a Mac.
• In Microsoft Word on Windows, type 21D4 and then press Alt+X to turn the code into ⇔.
• On a Mac, press Control+Cmd+Space to open the Character Viewer, then search for “left right double arrow”.
• On Linux, most desktops accept Ctrl+Shift+U, then 21d4, then Space or Enter.
• In HTML, use ⇔ or ⇔. In a CSS content property, use "\21D4".