Originally defined as the ratio between the circumference of a circle and its diameter, pi — written as the Greek letter π — appears throughout mathematics, including in areas that are completely ...

SAN FRANCISCO -- Every March 14, mathematicians, scientists and math lovers around the world celebrate Pi Day, a commemoration of the mathematical sign Pi. That's because the date written numerically ...

Today is March 14, aka 3.14, aka Pi Day. And did you know why it’s called “pi” rather than some other Greek symbol? Wikipedia speculates it’s because of the similarity to “perimeter,” an old ...

Ah, mathematical holidays. Pi Day is a celebration of the irrational number that is the ratio of the circumference of a circle to its diameter. It occurs every March 14 (because π is equal to 3.14159.