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Pi (uppercase Π, lower case π) is the sixteenth letter of the Greek alphabet, representing [p]. In the system of Greek numerals it has a value of 80. Letters that arose from pi include Cyrillic Pe (П, п), Coptic pi (Ⲡ, ⲡ), and Gothic pairthra (𐍀).

In Modern Greek, the name of the letter is pronounced ˈpi|; in modern English, it is ˈpaɪ, in particular when referring to the mathematical constant (see below).

The upper-case letter Π is used as a symbol for:

The lower-case letter π is used as a symbol for:

Variant pi or "pomega" (<math>\varpi\,\!</math> or ϖ) is a glyph variant of lower case pi sometimes used in technical contexts as though it were a lower-case omega with a macron, though historically it is simply a cursive form of pi, with its legs bent inward to meet. It is used as a symbol for:

In Unicode, the code point for capital Π is U+03A0 and for lower-case π it is U+03C0. The code point for ϖ, called greek pi symbol, is U+03D6, and that for the product symbol ∏, called n-ary product, is U+220F.

In HTML, the capital letter Π can be produced using the codes &Pi; or &#928;, and the lower-case by using &pi; or &#960; within the source code.[]

See also


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