It is the ratio of the circumference to the diameter of any perfect circle.
The value is approximately 3.14159, but we can't represent it completely accurately since it is a non repeating decimal which seems to go on forever. It cannot be represented exactly by a fraction either, although the approximate value 22/7 is often used.
Pi also occurs in many other formulae in different fields of physics, making it one of the proper mysteries of nature.
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