Pi Wiki

800px-Pi uc lc.svg.png

Pi (uppercase Π, lowercase π) is the fifth letter of the Greek Alphabet. It represents "p". In the Greek Numerals system, it has a value of 80.

It's Unicodes are:

U+03C0 π greek small letter pi (HTML: π π)

U+03A0 Π greek capital letter pi (HTML: Π Π)