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The number Ï is a mathematical constant, the ratio of a circle 's circumference to its diameter, commonly approximated as 3.14159. It has been represented by the Greek letter  Ï  since the mid-18th century, though it is also sometimes spelled out as  pi  (/paÉª/). Being an irrational number, Ï cannot be expressed exactly as a fraction (equivalently, its decimal representation never ends and never settles into a permanent repeating pattern).
March 14 is Pi Day, a day to celebrate the mathematical constant pi (Ï) and to eat lots of pie. Pi Day celebrates the mathematical constant Ï (3.14). Pi Day celebrates the mathematical constant Ï (3.14). Â©iStockphoto.com/marekuliasz. Celebrated in countries that follow the month/day (m/dd) date format, because the digits in the date, March 14 or 3/14, are the first three digits of Ï (3.14), Pi Day was founded by Physicist Larry Shaw in 1988.