The number 22/7=3.14159
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The symbol for pi (π), is the Greek letter that is the equivalent to the Roman p. It is the Greek letter pi. It is the first letter of the Greek word περίμετρος (perimetros) from which our word perimeter comes.
PI is the Latin name of the Greek letter(by Greek letter I mean the PI symbol.
In math, a value that represents a constant relationship is given a Greek letter to represent it. Examples are epsilon and sigma functions.The ratio of the circumference to the diameter of a circle is about 3.14159 but can be calculated to an infinite number of places. This was assigned the Greek letter pi (π).
There is no such letter because there is no interval between pi and pi.
Because the Greeks discovered the fact that the radius and circumference of a circle maintained a constant ratio.