Pi (letter)

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

Its Unicodes are:

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

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

Trivia

Other Greek letters used in mathematics include:

• Σ/Sigma : Either used as a Modulo Two-Sum or a N-ary Summation

• ε/Epislon : A Euler (Pronounced "Oiler") constant

• φ/Phi : Commonly used to stand for the golden ratio

And many others.