π

Pi

Unicode
U+03C0
Category
Math
HTML Entity
π
CSS
\03C0
The Pi symbol (π) is a fundamental mathematical constant representing the ratio of a circle's circumference to its diameter, roughly equal to 3.14159. Adopted from the lowercase Greek letter pi, it is universally recognized in geometry, trigonometry, and advanced physics equations. Outside of textbooks, internet users frequently share the symbol to celebrate Pi Day on March 14 or to express an overarching love for math and science.

How to Type

Windows
Alt+227
macOS
Option+P
Linux
Ctrl+Shift+U then 03C0
HTML
π

In Programming

Most programming languages rely on standard library constants like `Math.PI` (JavaScript) or `math.pi` (Python) for calculations rather than the literal character. However, languages with rich Unicode support, such as Julia, allow developers to use the π symbol directly in their code as a functional mathematical constant.

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Tags

3.14 3.14159 circle math circle ratio circumference formula constant geometry symbol greek letter irrational number march 14 math constant mathematics pi day pi number pi symbol text

Related Symbols

± Plus Minus Sign × Multiplication Sign ÷ Division Sign ≠ Not Equal To ≈ Approximately Equal To ∞ Infinity √ Square Root ∑ Summation ∫ Integral ≤ Less Than or Equal To ≥ Greater Than or Equal To ∂ Partial Differential