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 ...

Thursday, March 14, is National Pi Day, a time to celebrate the number that represents the ratio of a circle's circumference to its diameter. The number is known as π, the first letter of the Greek ...

Technically speaking, Pi Day has nothing to do with food and everything to do with an ultra-long mathematical number otherwise known as 3.14. But we’re always down for a holiday that offers us food ...

Some restaurants are offering special $3.14 promotions this Friday. In honor of Pi Day, pizza chains and national restaurants are celebrating the sweet holiday with special promotions and even some ...