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 ...

Each year, on March 14, it's become traditional for numerophiles and mathematicians to pause and reflect on the most famous of irrational numbers, pi. Pronounced pie, written as π, and summed up by ...

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.

INDIANAPOLIS -- March 14 -- or, if you'd prefer, 3.14 -- is the informal holiday celebrating everyone's favorite irrational number, pi. The ratio of a circle's circumference to its diameter, pi is a ...