Left Right Double Arrow
U+21D4Arrows
Also known as if and only ififf arrowequivalence arrow
Copy and paste ⇔. The Left Right Double Arrow character has Unicode code point U+21D4 and decimal HTML code ⇔.
Symbol codes
- Unicode
U+21D4- HTML Code
⇔- CSS Code
\21D4- HTML Entity
⇔- HEX Code
⇔
Technical properties
Unicode 18.0.0
- Code point
- U+21D4
- Decimal
- 8660
- Unicode name
- LEFT RIGHT DOUBLE ARROW
- Block
- Arrows · U+2190–U+21FF
- General category
- Math Symbol (Sm)
- Script
- Common
- Introduced
- Unicode 1.1
- JavaScript
- "\u21D4"
Appears in
About Left Right Double Arrow
⇔ is encoded in Unicode as code point U+21D4 (decimal 8660). Its official Unicode name is LEFT RIGHT DOUBLE ARROW.
It belongs to the Arrows block (U+2190–U+21FF), its General Category is Math Symbol (Sm), and it was added in Unicode 1.1, released in 1993. Its script value is Common: it is shared across writing systems rather than belonging to one.
Sources: Unicode Character Database 18.0.0, the HTML Standard’s list of named character references, and Unicode’s code page mappings.
How to type or insert Left Right Double Arrow
- Any device
- Select Copy symbol, then paste with Ctrl+V, or ⌘+V on a Mac.
- Microsoft Word
- Type
21D4, then press Alt+X. - macOS Character Viewer
- Press Control+⌘+Space and search for “left right double arrow”.
- Linux (GTK and IBus)
- Press Ctrl+Shift+U, type
21d4, then press Space. - HTML
⇔or⇔. In a UTF-8 page you can also paste the character itself.- CSS
content: "\21D4";in a::beforeor::afterrule.- JavaScript
"\u21D4"
Common questions about Left Right Double Arrow
What is the Left Right Double Arrow symbol?
⇔ (Left Right Double Arrow) is a math symbol in Unicode’s Arrows block. Its code point is U+21D4, and it has been part of the standard since Unicode 1.1 (1993). It is also known as if and only if, iff arrow, and equivalence arrow.
How do I copy and paste the Left Right Double Arrow symbol?
Select Copy symbol at the top of this page, then paste with Ctrl+V on Windows and Linux or ⌘+V on a Mac. On a phone, tap Copy symbol, then touch and hold where you want it and choose Paste. ⇔ pastes as ordinary text, so it works in documents, messages, and code.
How do I type the Left Right Double Arrow symbol on Windows?
In Microsoft Word, type 21D4 and press Alt+X to turn the code into ⇔. In any app, open Character Map from the Start menu, search for “left right double arrow”, then select and copy the character.
How do I type the Left Right Double Arrow symbol on a Mac?
Press Control+⌘+Space to open the Character Viewer, search for “left right double arrow”, and double-click the result to insert it.
How do I type the Left Right Double Arrow symbol on an iPhone or Android phone?
The simplest way is to copy it from this page and paste it where you need it. If you use it often, save it as a text shortcut: on iPhone, go to Settings > General > Keyboard > Text Replacement; with Gboard on Android, go to Gboard settings > Dictionary > Personal dictionary.
Can I use the Left Right Double Arrow symbol in Word, Google Docs, and social media?
Yes. ⇔ is a standard Unicode character, so you can paste it into Microsoft Word, Google Docs, emails, and posts or bios on Instagram, X, Facebook, and TikTok. In Google Docs you can also choose Insert > Special characters and search for “left right double arrow”. In Word, choose Insert > Symbol > More Symbols, set from to Unicode (hex), and enter 21D4 as the character code.
Is the Left Right Double Arrow symbol an emoji?
No. ⇔ is a text symbol, not an emoji. It takes the color and size of the surrounding text, and its exact shape depends on the font.
Why does the Left Right Double Arrow symbol show as a box or question mark?
An empty box or a question mark means the font on that device has no glyph for ⇔. The character is still there: it appears correctly wherever a font covers Unicode’s Arrows block, and free font families such as Google Noto cover nearly all of Unicode.
What are the HTML and CSS codes for the Left Right Double Arrow symbol?
In HTML, write ⇔ (decimal) or ⇔ (hexadecimal), or the named entity ⇔. In CSS, use content: "\21D4"; in a ::before or ::after rule, and in JavaScript "\u21D4". See all HTML codes.