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Pi, Greek letter (pi), is the symbol for the ratio of the circumference of a circle to its diameter. Pi = 3.1415926535... Pi Day is celebrated by math enthusiasts around the world on March 14th.

Pi Day and Pi Approximation Day are two holidays held to celebrate the mathematical constant Ŕ (pi). Pi Day is observed on March 14, 3.14 being the first three digits of pi. It is also Albert Einstein's birthday. It can also be celebrated on March 4 (when 14% of the month of March has elapsed). Pi Approximation Day is observed on July 22, due to Ŕ being roughly equal to 22/7.

Pi Minute is also sometimes celebrated on March 14 at 1:59 p.m. If Ŕ is truncated to seven decimal places, it becomes 3.1415926, making March 14 at 1:59:26 p.m., Pi Second (or sometimes March 14, 1592 at 6:53:58 a.m.).