Pi or 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) Pi (uppercase Π, lowercase π and ϖ; el, πι ) is the sixteenth letter of the Greek alphabet, representing the voiceless bilabial plosive . In the system of Greek numerals it has a value of 80. It was derived from the Phoenician letter Pe ...

, in 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) Pi () was a Zhou dynasty (1045–256 BC) vassal state in ancient China. Also known as Xue (), Pi was ruled by members of the ''Ren'' (任) family. Its progenitor Xi Zhong (奚仲), had been the Minister of Chariots (车正) for Yu the Great during ...

, an ancient state during China's Zhou dynasty *

Pi, Catalonia Pi is a small village belonging to the municipality of Bellver de Cerdanya, in the comarca of Cerdanya, vegueria The ''vegueria'' (; pl. ''vegueries'') was the feudal administrative territorial jurisdiction of the Principality of Catalonia (to ...

, an integrated village of Bellver de Cerdanya, Catalonia, Spain *

Pi County Pidu District formerly known as Pi County or Pixian is one of 11 urban districts of the prefecture-level city of Chengdu, the capital of Sichuan Province, Southwest China. It was approved from the former Pi County by the State Council on Novembe ...

, Sichuan province, China *

Pi Islands Pi Islands are two islands and several rocks which lie east of the northeast end of Omega Island among the Melchior Islands, Palmer Archipelago. The name, derived from the 16th letter of the Greek alphabet, appears to have been first used on a 1 ...

, Palmer Archipelago, Antarctica * Philippine Islands, another name for the Philippines

People

Given name

Pi de Bruijn Pi de Bruijn (born 28 August 1942) is a Dutch architect from Losser, Overijssel, the Netherlands . He is a design principal at the Office de Architecten Cie., located in Amsterdam. History Bruijn graduated from the Delft University of Technology ...

(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 Pi Vèriss, born Piet Visser, was a Dutch songwriter and composer probably best known for writing the Johnny Jordaan hit "Geef mij maar Amsterdam", an immensely popular '' Jordaanlied''. He was awarded the Golden Harp in 1986 for his entire body of ...

, Dutch songwriter and composer

Surname

Bi (surname) Bi () is a Chinese surname. It is listed 76th in the Song dynasty classic text, the ''Hundred Family Surnames''.K. S. Tom. 989(1989). Echoes from Old China: Life, Legends and Lore of the Middle Kingdom. University of Hawaii Press. . Notable peop ...

(), romanized as Pi in Wade–Giles *

Pi (surname) Pi is the Mandarin pinyin romanization of the Chinese surname written in Chinese character. It is romanized P'i in Wade–Giles, and Pei in Cantonese. Pi is listed 85th in the Song dynasty classic text ''Hundred Family Surnames''. According to ...

(), a Chinese surname * Enric Pi (born 1983), Catalan footballer * Francesc Pi i Margall (1824–1901), Catalan politician *

Jordi Sabater Pi Jordi Sabater Pi (2 August 1922 – 5 August 2009) was a Spanish-Catalan primatologist and worldwide specialist in ethology, the study of animal behavior. Sabater was known for describing the cultural behaviors of several species, including the ...

(1922–2009), Catalan primatologist and ethologist * Meritxell Mateu i Pi (born 1966), Andorran diplomat *

Ot Pi Ot Pi is a Spanish bike-trials rider, often regarded as the man responsible for the discipline's origin. He has won several world titles and is featured on a number of videos that showcase the sport. Ot Pi (aka "Hot Pie") Isern made his U.S. debu ...

(born 1970), Catalan mountain bike trials rider *

Pedro Pi Pedro Pi (14 September 1899 – 3 January 1970) was a sailor from Spain, who represented his country at the Sailing at the 1924 Summer Olympics – 6 Metre, 1924 Summer Olympics in Le Havre, France. References Sources

* * 1899 births ...

(1899–1970), Spanish sailor *

Renzo Pi Hugarte Renzo Wifredo Pi Hugarte (Durazno, 23 November 1934 – Montevideo, 15 August 2012) was a Uruguayan scholar, anthropologist, professor, historian and writer. Together with Daniel Vidart he is considered one of the "founding fathers" of anthropology ...

(1934–2012), Uruguayan anthropologist

Arts, entertainment, and media

Fictional characters

* Pi (.hack), a fictional character from the multimedia franchise ''.hack//G.U.'' * Pi, a character in both: ** ''

Life of Pi ''Life of Pi'' is a Canadian philosophical novel by Yann Martel published in 2001. The protagonist is Piscine Molitor "Pi" Patel, an Indian boy from Pondicherry, India who explores issues of spirituality and metaphysics from an early age. He s ...

'', a 2001 novel, and ** ''Life of Pi'' (film), a 2012 adaptation * Pi, a member of Team Robo in ''

Sega Soccer Slam ''Sega Soccer Slam'', also known as simply ''Soccer Slam'', is a sports game released for GameCube, Xbox, and PlayStation 2 in 2002. Gameplay ''Sega Soccer Slam'' is different from traditional sports games in its exaggerated interpretation of ...

'' * Pi, a character in the 2006 animated film '' Shark Bait'' and the 2012 sequel ''The Reef 2: High Tide''

Music

Pi (instrument) ''Pi'' ( th, ปี่, ) is the generic term for any of a variety of quadruple reed oboes used in the traditional music of Thailand, ''piphat''. It is very similar in construction and playing technique to Burmese Hne and Cambodian ''sralai''. V ...

, a generic term for a variety of double- or quadruple-reed oboes and a free-reed pipe of traditional Thai music * "π", a song by Kate Bush from '' Aerial'' * "Pi", a song by Hard 'n Phirm from ''

Horses and Grasses ''Horses and Grasses'' is the first and only studio album by the comedy band Hard 'n Phirm, released in 2005. Track listing # The Carbon Cycle – 2:19 # American Dinosaurs – 3:32 # An Intro – 0:35 # Pi – 3:14 # Ready – 0:22 # She Na ...

'' * Pi Recordings, a record label

Other arts, entertainment, and media

* ''Pi'' (film), a 1998 film directed by Darren Aronofsky * ''P.I.'' (TV series), 2017 Singaporean TV series * '' 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 Osmotic pressure is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane. It is also defined as the measure of the tendency of a solution to take in a pure ...

* P_i, 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 The Karnaugh map (KM or K-map) is a method of simplifying Boolean algebra expressions. Maurice Karnaugh introduced it in 1953 as a refinement of Edward W. Veitch's 1952 Veitch chart, which was a rediscovery of Allan Marquand's 1881 ''logica ...

* Raspberry Pi, a single-board computer

Mathematics

* , a glyph representing the product of a sequence of terms * , a set in the arithmetical hierarchy * , a set in the analytical hierarchy * , a set in the polynomial hierarchy * (Pi function), the

Gamma function In mathematics, the gamma function (represented by , the capital letter gamma from the Greek alphabet) is one commonly used extension of the factorial function to complex numbers. The gamma function is defined for all complex numbers except ...

when offset to coincide with the factorial * , the complete elliptic integral of the third kind * , the th

homotopy group In mathematics, homotopy groups are used in algebraic topology to classify topological spaces. The first and simplest homotopy group is the fundamental group, denoted \pi_1(X), which records information about loops in a space. Intuitively, homotop ...

of * -calculus, a process calculus *

Prime-counting function In mathematics, the prime-counting function is the function counting the number of prime numbers less than or equal to some real number ''x''. It is denoted by (''x'') (unrelated to the number ). History Of great interest in number theory is t ...

or *

\pi

, the

population proportion In statistics, a population proportion, generally denoted by P or the Greek letter \pi, is a parameter that describes a percentage value associated with a population. For example, the 2010 United States Census showed that 83.7% of the American po ...

in statistics

Physics

* Pion or π, a subatomic particle

Other uses

* Pi (prefix symbol), the prefix symbol of the binary unit prefix pebi * Π, for plaintiff, in legal shorthand * Π, stands for

Pierikos F.C. S.F.K. Pierikos ( el, Σ.Φ.Κ. Πιερικός) is a Greek football club based in Katerini, Greece, part of the major multi-sport club of the same name. Their name was inspired from the State's name of Pieria. The club recently competed in ...

kit logo * Pi Day, an annual celebration of March 14 (3/14)'s relationship with the mathematical constant * Principal investigator, holder of an independent grant * Private investigator