The letter before Pi is Omicron reprsented by 'O' in caps and 'o' in small case.
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 Greek capital letter for Pi is Π.
The term pi comes from the greek letter pi, which is the first letter of the word which in English is "perimeter".
The Greek word for perimeter begins with the letter pi, and since circumference and perimeter are the same the letter Pi was used.
Pi is a Greek letter for the "P" sound.
The letter Pi (π) is capitalized to Π
Pi is a letter of the Greek alphabet.
Pi is the sixteenth letter of the Greek alphabet.Π,π
The letter between pi and sigma in the Greek alphabet is rho.
The value for Pi for math is 3.14. Pi is the 16th letter in the Greek alphabet.
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.