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{{wiktionary|pi|π|Π}}
{{Redirect-distinguish|π|El (Cyrillic){{!}}л}}
'''[[Pi]]''' ({{pi}}) is a mathematical constant equal to a circle's circumference divided by its diameter.

'''Pi''', '''π''' or '''Π''' may also refer to:
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==Language and typography==
* [[Pi (letter)]], the 17th letter of the Greek alphabet
* [[Linotype machine#Pi matrices|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)

== Places ==
* [[Pi (state)]], an ancient state during China's Zhou dynasty
* [[Pi, Catalonia]], a village of Bellver de Cerdanya, Spain
* [[Pi County]], Sichuan province, China
* [[Pi Islands]], Palmer Archipelago, Antarctica

==People==
===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

===Stage name===
*[[Pi (entertainer)]], American drag performer

===Surname===
* [[Bi (surname)]] ({{zh|s=毕|links=no}}), romanized as Pi in Wade–Giles
* [[Pi (surname)]] ({{zh|s=皮|links=no}}), a Chinese surname
* [[Enric Pi]] (born 1983), Catalan footballer
* [[Francesc Pi i Margall]] (1824–1901), Catalan politician
<!--- * [[Jean Eugene Pi]] (1875-1942), Genevan photographer, migrated to San Rafael, Mendoza, Argentina. ----- redlinked DOESNT EXIST YET -->
* [[Jordi Sabater Pi]] (1922–2009), Catalan primatologist and ethologist
* [[Meritxell Mateu i Pi]] (born 1966), Andorran diplomat
* [[Ot Pi]] (born 1970), Catalan mountain bike trials rider
* [[Pedro Pi]] (1899–1970), Spanish sailor
* [[Renzo Pi Hugarte]] (1934–2012), Uruguayan anthropologist

==Arts, entertainment, and media==

===Fictional characters===
* [[Pi (.hack)]], in the multimedia franchise ''.hack//G.U.''
* Pi, in both:
** ''[[Life of Pi]]'', a 2001 novel, and
** [[Life of Pi (film)|''Life of Pi'' (film)]], a 2012 adaptation
* Pi, a member of Team Robo in ''[[Sega Soccer Slam]]''
* Pi, in the 2006 animated film ''[[Shark Bait (2006 film)|Shark Bait]]'' and the 2012 sequel ''The Reef 2: High Tide''

===Music===
* [[Pi (instrument)]], several traditional Thai reed instruments
* "π", a song by Kate Bush from ''[[Aerial (album)|Aerial]]''
* "Pi", a song by Hard 'n Phirm from ''[[Horses and Grasses]]''
* "Pi", a song by J. Cole from ''[[Might Delete Later]]''
* [[Pi Recordings]], a record label

===Other arts, entertainment, and media===
* [[Pi (film)|''Pi'' (film)]], a 1998 film directed by Darren Aronofsky
*[[P.I. (TV series)|''P.I.'' (TV series)]], a 2017 Singaporean 1series
* ''[[Pi magazine]]'', a student publication of the University College London Union
* [[Pi Studios]], a video game developer

==Science and mathematics==

===Chemistry and biochemistry===
* π, a measure of [[nucleotide diversity]]
* Π or [[Osmotic pressure]] 
* P<sub>i</sub>, an inorganic [[phosphate]] group
* [[Isoelectric point]] (pI), the pH at which a particular molecule carries no net electrical charge in the statistical mean
* [[Pi bond]], a chemical bond

===Logic and computer science===
* Π, the symbol for [[maxterm]] notation in [[Karnaugh map#Example|Karnaugh mapping]]
* [[Raspberry Pi]], a single-board computer developed by Raspberry Pi Foundation; also known as Pi

===Mathematics===
* {{math|Π}}, a glyph representing the [[Multiplication#Capital pi notation|product of a sequence of terms]]
* {{math|Π{{su|p=0|b=''n''}}}}, a set in the [[arithmetical hierarchy]]
* {{math|Π{{su|p=1|b=''n''}}}}, a set in the [[analytical hierarchy]]
* {{math|Π{{su|p=''P''|b=''i''}}}}, a set in the [[polynomial hierarchy]]
* {{math|Π(''x'')}} (Pi function), the [[Gamma function]] when offset to coincide with the factorial
* {{math|Π(''n, k'')}}, the [[Elliptic integral#Complete elliptic integral of the third kind|complete elliptic integral of the third kind]]
* {{math|''π''<sub>''n''</sub>(''X'')}}, the {{mvar|n}}th [[homotopy group]] of {{mvar|X}}
* {{math|Π<sub>''n''</sub>(''X'')}}, the [[Fundamental ∞-groupoid|fundamental ''n''-groupoid]] of {{mvar|X}}
** {{math|Π(''X'')}}, the [[fundamental groupoid]] of {{mvar|X}}
* {{math|''π''<sup>''n''</sup>(''X'')}}, the {{mvar|n}}th [[cohomotopy set]] of {{mvar|X}}
* {{math|''π''<sub>''n''</sub>}}, a notation for the [[scalar projection]] onto the ''n''-th component
* [[π-calculus|{{pi}}-calculus]], a process calculus
* [[Prime-counting function]] or {{math|''π''(''x'')}}
* <math>\pi</math>, the [[population proportion]] in statistics

===Physics===
* [[Pion]] or π, a subatomic particle

== Other uses ==
* [[Pi (prefix symbol)]], or pebi, in computing
* Π, for plaintiff, in [[legal shorthand]]
* Π, stands for [[Pierikos F.C.]] kit logo
* [[Pi Day]], March 14 (3/14 in the US)
* [[Principal investigator]], a lead researcher
* [[Private investigator]]

== See also ==
{{canned search|π|pi}}
* [[PI (disambiguation)]]
* {{lookfrom|π}}
* {{intitle|π}}
* {{srt|1}}
* [[P (disambiguation)]]
* [[Pai (disambiguation)]]
* [[Pie (disambiguation)]]
* [[Pye (disambiguation)]]

{{Disambiguation|surname}}