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), 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), 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 Surname Bi (surname) (), romanized as Pi in Wade–Giles Pi (surname) (), 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 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 Pi Studios, a video game developer 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 Mathematics , a glyph representing the product of a sequence of terms , a set in the arithmetical hierarchy , a set in the analytical hierarchy ,