Infinity Symbol ∞ – How to Type on Keyboard (Windows, Mac, HTML)

∞

Infinity — Click to copy

The infinity symbol ∞ represents endlessness — in math, philosophy, tattoos, and jewelry. Here’s how to type it on any device.

Quick Answer: Hold Alt and type 236 (Windows), or press Option + 5 (Mac). The ∞ appears instantly.

Quick Reference

Symbol ∞
Name Infinity
Windows Alt + 236
Mac Option + 5
Unicode U+221E
HTML ∞

What Is the Infinity Symbol?

∞ represents infinity — something endless, unlimited, boundless. Used in mathematics, philosophy, physics, tattoos, and jewelry designs.

How to Type ∞ on Windows

Alt code: Alt + 236 (number pad).
Emoji panel: Win + . > “infinity”.

How to Type ∞ on Mac

Option + 5. One of the easiest Mac symbol shortcuts!

How to Type ∞ in Word & Office

Type 221E then Alt+X. Or Insert > Symbol.

How to Type ∞ in Google Docs

Insert > Special characters > search “infinity”.

How to Type ∞ on Mobile

iPhone: 123 > #+= > find ∞.
Android: ?123 > symbols > ∞.

How to Type ∞ in HTML

Use ∞ or ∞.

Troubleshooting

1. Alt+236 needs number pad.
2. Mac Option+5 is the easiest way.
3. Copy ∞ from the top of this page.

FAQs

Alt code for ∞?

The Alt code is 236. Hold Alt, type 236 on the numeric keypad with Num Lock on, then release Alt.

Mac shortcut?

Press Option + 5 on a Mac — one of the easiest symbol shortcuts to remember. The ∞ appears instantly.

Unicode?

The Unicode code point is U+221E. In HTML you can write it as ∞ or ∞.

HTML?

Use the named entity ∞ in your HTML. The decimal ∞ works exactly the same in every browser.

Who invented the symbol?

The English mathematician John Wallis introduced ∞ in 1655 in his work De Sectionibus Conicis. It has represented infinity ever since.

In Word?

Type 221E then press Alt+X and Word converts it to ∞. Or use Insert > Symbol to find it.

On iPhone?

On iPhone, tap 123 then #+= and look for ∞ on the symbols page. On Android, open the symbols keyboard (?123) and find it there.

Is it just a sideways 8?

It looks like one, but no — ∞ (U+221E) is its own character with its own meaning. A sideways digit 8 would not carry the infinity semantics in math or code.

Copy-paste safe?

Yes, ∞ is supported by virtually all fonts and platforms. Copy it from this page whenever a shortcut is inconvenient.

More math symbols?

Yes — the Symbol Picker has a full Math category with ±, ×, ÷, √, and ∑. Browse it for the complete set.

Conclusion

Alt+236 / Option+5. Code: ∞.

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