Pi (π) is a mathematical constant equal to a circle's circumference divided by its diameter.
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pi,
π, or
Π in Wiktionary, the free dictionary.
Pi, π or Π may also refer to:
- Pi (letter), the 17th letter of the Greek alphabet
- Pi characters, uncommon characters in typesetting
- Pi font, a term for some kinds of dingbat fonts
- Pali, an Indo-Aryan language (ISO 639-1 code: pi)
Given name
- Pi de Bruijn (born 1942), Dutch architect
- Pi O or П. O. (born 1951), Greek-Australian anarchist poet
- Pi Schwert (1892–1941), American baseball player and politician
- Pi Vèriss, Dutch songwriter and composer
Fictional characters
- Pi (.hack), in the multimedia franchise .hack//G.U.
- Pi, in both:
- Pi, a member of Team Robo in Sega Soccer Slam
- Pi, in the 2006 animated film Shark Bait and the 2012 sequel The Reef 2: High Tide
Chemistry and biochemistry
Logic and computer science
Mathematics
- Π, a glyph representing the product of a sequence of terms
- Π0
n, a set in the arithmetical hierarchy
- Π1
n, a set in the analytical hierarchy
- ΠP
i, a set in the polynomial hierarchy
- Π(x) (Pi function), the Gamma function when offset to coincide with the factorial
- Π(n, k), the complete elliptic integral of the third kind
- πn(X), the nth homotopy group of X
- π-calculus, a process calculus
- Prime-counting function or π(x)
, the population proportion in statistics
Physics
- Pion or π, a subatomic particle
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