∫
∫ Integral Symbol
The integral sign (∫) denotes integration — the antiderivative of a function, or the area under its curve.
Also known as: integral symbol, antiderivative symbol, integration sign.
Codes
| Symbol | ∫ | |
| Unicode | U+222B | |
| HTML entity (named) | ∫ | |
| HTML entity (decimal) | ∫ | |
| HTML entity (hex) | ∫ | |
| CSS | \222B | |
| LaTeX | \int | |
| Windows Alt code | Alt + 8747 |
How to type ∫ (Integral Symbol)
WindowsAlt + 8747
In Microsoft Word, type 222B then Alt + X. In other apps, open the emoji/symbol panel with Win + . (period) and search “integral”, or copy from above.
Mac⌥ + B
Press Option + b.
Microsoft Word222B, Alt + X
Type 222B, then press Alt + X to convert it to ∫.
Google Docs
Insert → Special characters, then search “integral” — or inside an Equation type \int.
LaTeX\int
Use \int in math mode. Add limits with \int_a^b, and use \displaystyle (or display math) to get the large sign.
Usage
- ∫ f(x) dx is the indefinite integral (antiderivative) of f; ∫ₐᵇ f(x) dx is the definite integral from a to b.
- Repeated integrals have their own characters: ∬ (U+222C) double, ∭ (U+222D) triple, ∮ (U+222E) contour.
- In LaTeX the sign grows in display mode — \int in inline text renders smaller than the same \int in a displayed equation.