The symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter π, sometimes spelled out as pi.[1]

Dec 10, 2025 · The symbol for pi is π. It was first used by British mathematician William Jones in 1706 to represent the ratio and was later popularized by the Swiss mathematician Leonhard …

Copy and paste pi symbol and learn how to type a pi sign on mac and win. π.

Pi is the ratio of the circumference of a circle to its diameter: Using this relationship, we can determine equation for the circumference of a circle by solving for C:

The pi symbol (π) is a Greek letter used to represent the ratio of a circle’s circumference to its diameter. It’s been used in this way for over 250 years.

Draw a circle with a diameter (all the way across the circle) of 1. Then the circumference (all the way around the circle) is 3.14159265... a number known as Pi. Pi (pronounced like "pie") is …

The Greek small letter π (pi) is used in trigonometry as a constant to represent a half-rotation around a circle in radians. The value of π is approximately 3.14159 and appears in many math …