| Character | ∞ |
| Name | Infinity |
| Unicode Code Point | U+221E |
| Decimal Value | 8734 |
| Hex Value | 0x221E |
| Category | Math Operators |
| Windows Alt Code | Alt+236 |
| Word Alt+X Code | 221E + Alt+X |
| Mac Shortcut | Option+5 |
| HTML Entity | ∞ |
| HTML Code (Dec / Hex) | ∞ / ∞ |
| CSS Content Code | content: "\221E"; |
| JavaScript Unicode Escape | "\u{221E}" |
Infinity is a formal mathematical operator or relation symbol used in academic and technical writing — algebra, calculus, logic, or set theory — to express a precise mathematical relationship concisely.
Unicode block: Mathematical Operators (U+2200–U+22FF). This large block standardizes the symbols used across algebra, calculus, logic, and set theory, replacing the inconsistent, often hand-drawn notation used before digital typesetting.
At Unicode code point U+221E (decimal 8734), Infinity is the 31st of 256 characters cataloged in this category on How To Type Any Symbol. In terms of typing methods, it is one of the characters in this block with both a documented Windows Alt code and a Mac keyboard shortcut, making it typeable without copy-paste on either platform. Regardless of platform, clicking the copy button above places the exact character on your clipboard, ready to paste into any application that accepts Unicode text.
💡 Good to know: This symbol's meaning is typically fixed by mathematical convention — using it loosely or decoratively outside a math context can confuse technically literate readers.
Hold Alt and type 236 on the numeric keypad.
Press Option+5.
Click the symbol above to copy it, then paste anywhere — works on every device and OS.
Use the entity ∞ in your HTML.