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There is no such letter because there is no interval between pi and pi.
PI is the Latin name of the Greek letter(by Greek letter I mean the PI symbol.
The symbol of pi is 16th letter of the Greek alphabet and it was chosen because the first letter of the equivalent of the word perimeter begins with pi in the Greek language.
The 'symbol' is a letter in the Greek alphabet - which is pronounced 'pi'. The connection between the letter and the ratio of the diameter and the circumference fo a circle may come from the fact that the letter pi is the first letter of the Greek word for perimeter, and the word for periphery.
PI is the 16 letter of theGreek alphabet which is equivalent to the English letter P. The symbol for it is the same as the mathematical term for pi: