Pi (disambiguation)
Pi (π) is a mathematical constant equal to a circle's circumference divided by its diameter.
Pi, π or Π may also refer to:
Language and typography
- 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)
 
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) (Chinese: 毕), romanized as Pi in Wade–Giles
 - Pi (surname) (Chinese: 皮), a Chinese surname
 - Enric Pi (born 1983), Catalan footballer
 - Francesc Pi i Margall (1824–1901), Catalan politician
 - 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), a 2012 adaptation
 
 - 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
 
Music
- Pi (instrument), several traditional Thai reed instruments
 - "π", a song by Kate Bush from Aerial
 - "Pi", a song by Hard 'n Phirm from Horses and Grasses
 - "Pi", a song by J. Cole from Might Delete Later
 - "Pi", a song by Käptn Peng & Die Tentakel von Delphi from Das nullte Kapitel
 - Pi Recordings, a record label
 
Other arts, entertainment, and media
- Pi (film), a 1998 film directed by Darren Aronofsky
 - P.I. (TV series), a 2017 Singaporean 1series
 - Pi magazine, a student publication of the University College London Union
 
Science and mathematics
Chemistry and biochemistry
- π, a measure of nucleotide diversity
 - Π or Osmotic pressure
 - Pi, 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 mapping
 - Raspberry Pi, a single-board computer developed by Raspberry Pi Foundation; also known as Pi
 
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
 - Πn(X), the fundamental n-groupoid of X 
- Π(X), the fundamental groupoid of X
 
 - πn(X), the nth cohomotopy set of X
 - πn, a notation for the scalar projection onto the n-th component
 - π-calculus, a process calculus
 - Prime-counting function or π(x)
 - , 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
- PI (disambiguation)
 - All pages with titles beginning with π
 - All pages with titles containing π
 - All pages with titles beginning with Pi
 - All pages with titles containing Pi
 - P (disambiguation)
 - Pai (disambiguation)
 - Pie (disambiguation)
 - Pye (disambiguation)