Pi

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Pi

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 product operator in mathematics, indicated with capital pi notation ∏ (in analogy to the use of the capital Sigma Σ as summation symbol).
In textual criticism, Codex Petropolitanus, a 9th century, uncial codex of the Gospels, now located in St. Petersburg, Russia.
In legal shorthand, it represents a plaintiff.

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

The mathematical transcendental (and thus irrational) constant π ≈ 3.14159…, the ratio of a circle's circumference to its diameter in Euclidean geometry. The letter "π" is the first letter of the Greek words "περιφέρεια" 'periphery' and "περίμετρος" 'perimeter', i.e. the circumference.
The prime-counting function in mathematics.
Homotopy groups in algebraic topology.
Dimensionless parameters constructed using the Buckingham π theorem of dimensional analysis.
The osmotic pressure in chemistry. π=MRT
The elementary particle called the pi meson or pion.
Economic profit in microeconomics.
Inflation rate in macroeconomics.
A type of chemical bond in which the P-orbitals overlap, called a pi bond.
The natural projection on the tangent bundle on a manifold.
The unary operation of projection in relational algebra.

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:

perihelion
The angular frequency of a wave in fluid dynamics (angular frequency is usually represented by <math>\omega</math> but this may be confused with vorticity in a fluid dynamics context).
The longitude of pericenter in celestial mechanics.^[]
Comoving distance in cosmology.^[]

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 Π or Π, and the lower-case by using π or π within the source code.^[]

References

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