∬
Math Operator 41
- Unicode
- U+222C
- Category
- Math
- HTML Entity
- ∬
- CSS
- \222C
The ∬ (Double Integral) symbol is a mathematical operator used in calculus to represent integration over a two-dimensional region. Visually consisting of two standard integral signs placed side-by-side, it is commonly used to calculate quantities like surface area, mass, or the volume under a mathematical surface. While rarely seen in casual texting, it is essential in academic papers, technical documentation, and mathematical software.
How to Type
- Windows
- Alt+8748 (on numeric keypad) or type 222C then press Alt+X in Microsoft Word
- macOS
- Control+Command+Space then search "double integral"
- Linux
- Ctrl+Shift+U then type 222c and press Space
- HTML
- &iint; or ∬
In Programming
In mathematical typesetting languages like LaTeX, this symbol is generated using the `\iint` command. It is predominantly used alongside rendering libraries like MathJax or KaTeX to display complex calculus equations accurately on web pages.
Tags
2d integral
LaTeX double integral
area
calculus
double integral
double integral sign
iint LaTeX
math operator
mathematics
multivariable calculus
surface
surface area integral
two integrals
∬ symbol