# Greek Small Letter Pi

π
Symbol Format Data
π Code Point
U+03C0
TeX
\pi
SVG

## Usage

The Greek small letter (pi) is used in trigonometry as a constant to represent a half-rotation around a circle in radians. The value of is approximately and appears in many math formulas and expressions. Read more…

## Related

The capital Greek letter Π (Pi) is used in algebra to represent the product operator. The product operator has three parts: the initial index value, an end value, and the expression being multiplied together.