Infinity Symbol (∞)
Copy the infinity sign with one click, plus the Alt code and Mac shortcut to type it.
How to type these symbols
| Symbol | Name | Windows (Alt code) | Mac | HTML |
|---|---|---|---|---|
| ∞ | Infinity | Alt+236 | Option+5 | ∞ |
| ∝ | Proportional to | - | - | ∝ |
| ℵ | Aleph | - | - | ℵ |
Windows Alt codes need the numeric keypad with Num Lock on. No keypad? Copying from this page is faster anyway.
Copy the infinity symbol
Click the ∞ above and it is on your clipboard, ready to paste into a bio, a caption, a maths answer, or a note. It is a single Unicode character (U+221E), so it pastes cleanly into any app, document, spreadsheet, or message on any device.
How to type infinity on Windows, Mac and phones
On Windows, hold Alt and type 236 on the numeric keypad with Num Lock on (Alt+8734 works too). On a Mac, press Option+5. In Word you can type 221E and then press Alt+X to fold it into the ∞ character. On iPhone and Android there is no long-press key for it, so the easiest route on a phone is to copy it from here or set up a text replacement that expands a short trigger into ∞.
Infinity in math writing
The ∞ sign marks unbounded growth: a limit as x approaches infinity, or an interval written as (0, ∞). It is a concept rather than a number you can add or divide, which is why it behaves differently from an ordinary value. For the size of infinite sets, mathematicians reach for aleph (ℵ) instead of the ∞ sign, and in LaTeX the symbol is \infty.
The infinity emoji
There is an emoji version, ♾️ (U+267E followed by a variation selector), which renders as small colored artwork on phones and social apps. The plain ∞ stays as text and inherits your font's color and weight, so it sits neatly inside a sentence. Copy whichever look you are after.
Where people use it
The infinity symbol turns up in Instagram and TikTok bios, friendship and couple captions, forever-and-always notes, tattoo-in-progress sketches, and dates meant to read as endless. Because it is one character, it survives tight character limits better than most decorations. John Wallis introduced the ∞ sign back in 1655, and it has been shorthand for endlessness ever since.
Frequently asked questions
How do I type the infinity symbol on Windows?
Hold Alt and type 236 on the numeric keypad with Num Lock on, and you get ∞ (Alt+8734 also works). In Word you can type 221E and then press Alt+X to turn it into the symbol. On a laptop without a keypad, copying it from this page is faster.
How do I type the infinity symbol on a Mac?
Press Option+5 and you get ∞ in most apps. If a shortcut ever fails, the character above copies to your clipboard with one click.
Is there an infinity emoji?
Yes, ♾️ (U+267E with a variation selector). It renders as small colored artwork on phones and social apps, while the plain ∞ (U+221E) stays as text and takes on your font's color and weight. Copy whichever look fits.
What does ∞ mean in maths?
It marks unbounded growth, such as a limit as x approaches infinity or an interval written as (0, ∞). It is a concept marker rather than a number you can add or divide, so it behaves differently from an ordinary value.
How do I get the infinity symbol on my phone?
There is no long-press key for it on iPhone or Android, so the simplest way is to copy ∞ from this page. If you use it often, create a keyboard text replacement that expands a short trigger into ∞.