Pi is approximately equal to 3.141592652389793238462.
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Mathematician Rudolph Swetchefriz{Added} The symbol is not "for" pi but is pi - one of the letters of the Greek alphabet.
Actually, the number was discovered and then a symbol had to be assigned to it. Letters of the Greek alphabet are traditionally used for mathematical things, to the symbol for pi was naturally chosen from the Greek alphabet.
pi is represented by the Greek letter (of the same name) π and is the ratio of the circumference of a circle to its diameter.
Find the exact value of the mathematical symbol pi.
pi is equal to 3.141592653589793238462643383279502884197169399375105...., pi is actually a endless mathematical ratio. pi is sometimes approximated by 22 over 7.