Definify.com
Definition 2025
Π
Π
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Translingual
Symbol
Π
- (mathematics) Product over a set of like terms:
- (mathematics, logic, computer science) A class (in some hierarchy of formulae, like the arithmetical hierarchy or polynomial hierarchy) of those formulae whose outermost quantifiers are universal quantifiers.
Usage notes
- (mathematics): Though there exists a distinct code point (∏) for the purpose of the mathematical product, the upper case pi here continues to be used for convenience.
See also
π
π
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Translingual

This mosaic is outside the mathematics building at the Technische Universität Berlin.


When a circle's radius is 1 unit, its circumference is 2π units.
Symbol
π
- (mathematics) An irrational constant representing the ratio of the circumference of a circle to its diameter; approximately 3.14159265.
- (particle physics) pion, pi meson
- (mathematics) homotopy group
See also
Greek
Letter
π • (p) (lowercase, uppercase Π)
- The lower case letter pi (πι), the 16th letter of the modern Greek alphabet.
Numeral
π'
- The number 80 in Greek numerals.
,π
- The number 80,000 in Greek numerals.
- (The Greek letter pi.)
See also
- see: Appendix:Greek alphabet