∺
Math Operator 55
- Unicode
- U+223A
- Category
- Math
- HTML Entity
- ∺
- CSS
- \223A
The geometric proportion symbol (∺) is a mathematical operator used to show that two ratios are proportional to one another. Serving as an alternative to the more common double colon (::) or equals sign (=), it appears in equations to indicate that the ratio of A to B is exactly the same as C to D. While largely replaced by standard algebraic notation in modern math, you might still spot this distinct symbol in historical texts, geometry formulas, or specialized technical typography.
How to Type
- Windows
- Alt+8762 or type 223A then press Alt+X in Microsoft Word
- macOS
- Control+Command+Space, then search "geometric proportion"
- Linux
- Ctrl+Shift+U, type 223a, then press Enter
- HTML
- ∺ or ∺
In Programming
This symbol is not used as a functional operator in mainstream programming languages, but it is supported in mathematical markup environments like MathML and LaTeX (via the unicode-math package as \geoprop) for rendering digital equations.
Tags
a to b equals c to d
analogy
double colon proportion
equal ratios notation
four dots
geometric proportion
geometric ratio symbol
geometry proportion
historic math notation
mathematics
proportion operator
ratio