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Pi Day celebrates the mathematical constant π (pi).
Pi is the distance around a perfect circle, or the circumference, divided by the distance across it, or the diameter. (This calculation is used in determining the area of a circle, the volume of a sphere, and other mathematical formulas.) The solution, or Pi, is an infinite approximation beginning with 3.1415926535897932... and continuing with no pattern in the numbers.
Since the first three digits of π in decimal form are 3.14, Pi Day is observed on 3/14, or March 14 of each year.
A Biography of the World's Most Mysterious Number
Pi Pie Pan
Personalized Christmas Stockings