If and only if arrow (⇔)
U+21D4 · LEFT RIGHT DOUBLE ARROW · Unicode 1.1 (1993)
How to type ⇔
Windows
No Alt code
⇔ is not in the Windows code pages 1252 or 437, so it has no Alt code. Use one of the methods below or copy it from this page.
Word and Outlook: Alt + X
21D4 Alt+X
Type 21D4 and press Alt+X right after it: Word turns the code into ⇔. Press Alt+X again to turn it back into the code.
Emoji and symbols panel (Windows 10 and 11)
Win+.
Press Win + full stop (.) to open the panel, go to the Symbols tab (Ω) and pick ⇔.
No numeric keypad on your laptop? See the other ways in our Alt codes guide.
Mac
Character Viewer
Ctrl+⌘ Cmd+Space
Press Ctrl+⌘+Space (or the Globe key + E), search for “if and only if arrow” and click ⇔ to insert it.
iPhone
Make a shortcut (Text Replacement)
Turn a short word into ⇔ once and type it in any app:
- Copy ⇔ from this page.
- Open Settings › General › Keyboard › Text Replacement and tap +.
- Paste ⇔ as the Phrase and type a Shortcut, for example ;ifandonlyi.
- Now type ;ifandonlyi anywhere: the keyboard suggests ⇔.
Android
Make a shortcut (Gboard personal dictionary)
Teach your keyboard a short word that turns into ⇔:
- Copy ⇔ from this page.
- Open Gboard settings › Dictionary › Personal dictionary, choose your language and tap +.
- Paste ⇔ as the word and type a shortcut, for example ;ifandonlyi.
- Type ;ifandonlyi in any app and tap ⇔ in the suggestions.
Linux
Unicode input
Ctrl+Shift+U 21d4 Enter
Press Ctrl+Shift+U, type 21d4 and press Enter or Space. Works in GTK apps and with IBus (GNOME, Ubuntu, Fedora).
What ⇔ means and how it is used
In Unicode, ⇔ is code point U+21D4 with the official name LEFT RIGHT DOUBLE ARROW. It belongs to the Arrows block and arrived with Unicode 1.1 in 1993.
Other words for it: arrow, double, left, right.
You will find it in our arrows, 195 symbols in all, together with → ← ↑ ↓ ↔.
Codes for HTML, CSS and JavaScript
Tap Copy next to the code you need.
| HTML entity | ⇔ | |
|---|---|---|
| HTML decimal | ⇔ | |
| HTML hex | ⇔ | |
| CSS | content: "\21D4"; | |
| JavaScript | \u21D4 | |
| URL | %E2%87%94 | |
| UTF-8 bytes | E2 87 94 | |
| Unicode | U+21D4 |
Will it show on my friend's phone?
⇔ has been in Unicode since version 1.1 (1993). Practically every phone, computer and app shows it.
Checking your device…
Names in other languages
What ⇔ is called in the 12 languages of this site (Unicode CLDR and our editors). Tap a name to open that language's page.
| Language | Name |
|---|---|
| English | If and only if arrow |
| Português | Seta de equivalência (se e somente se) |
| Español | Doble implicación (si y solo si) |
| Italiano | Doppia implicazione (se e solo se) |
| Français | Équivalence logique (si et seulement si) |
| Deutsch | Äquivalenzpfeil |
| Türkçe | Çift gerektirme oku (ancak ve ancak) |
| Bahasa Indonesia | Simbol biimplikasi |
| Polski | Strzałka równoważności |
| Русский | Знак эквивалентности |
| 日本語 | 同値記号 |
| 한국어 | 동치 기호 |
Related symbols
All Arrows →Questions people ask
How do I type ⇔ on a laptop without a numeric keypad?
On Windows press Win + full stop (.) and pick ⇔ in the Symbols tab, or in Word type 21D4 and press Alt+X.
How do I type ⇔ on an iPhone?
The iPhone keyboard has no key for ⇔. Copy it here, then add it in Settings › General › Keyboard › Text Replacement with a shortcut like ;ifandonlyi.
What is the HTML code for the if and only if arrow?
Use the entity ⇔ or the numeric code ⇔ (hex ⇔). In CSS write \21D4, in JavaScript \u21D4.
Will ⇔ show on every phone?
⇔ has been in Unicode since version 1.1 (1993). Practically every phone, computer and app shows it.