∞
Math Operator 221E in Mathematics
In Mathematics, the Math Operator 221E symbol (∞) is commonly used. Learn how to copy and use it in your technical documents.
Unicode
U+221E
HTML Entity
∞
LaTeX Sequence
\mathoperator221e
Primary Field
MathematicsMathematics Application
The infinity symbol denotes an unbounded quantity — something without limit. It is used to describe limits that grow without bound (lim → ∞), infinite intervals, and the bounds of improper integrals.
How to type Infinity (∞)
- Fastest: click ∞ on the keyboard above — it copies to your clipboard, ready to paste into Word, Google Docs, email or a forum.
- Unicode: the code point is shown in the panel above; on Windows you can also use Alt‑X after the hex code in Word.
- LaTeX: use the command shown above inside math mode.
- Anywhere: because it’s standard Unicode, it keeps its exact form across apps and devices.
Frequently asked questions
What does ∞ mean in a limit?
That the quantity increases without bound rather than approaching a finite value.
Is infinity a number?
No — it is a concept of unboundedness, used carefully in calculus and set theory rather than as an ordinary number.
Write mathematical and scientific expressions
Need to pair this symbol with other operators?