• Pi (letter), a Greek letter

Places

• Pi/貔, or Zhiyi/执夷, like tiger, different animal with Xiu/貅

• Pi (state)/邳, an ancient state during China's Shang dynasty

• Pi, Catalonia, an integrated village of Bellver de Cerdanya, Catalonia, Spain

• Pi County, Sichuan province, China

• Pi Islands, Palmer Archipelago, Antarctica

• P.I. or Philippine Islands

People

Given name

• Pi de Bruijn (born 1942), Dutch architect

• Pi Schwert (1892-1941), American baseball player and politician

• Pi Vèriss, Dutch songwriter and composer

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), a fictional character from the multimedia franchise .hack//G.U.

• Pi, a character in Life of Pi

• Pi, a member of Team Robo in Sega Soccer Slam

Films

• Pi (film), a 1998 film directed by Darren Aronofsky

• Life of Pi (film), a 2012 film based on Yann Martel's 2001 novel of the same name

Music

• Pi (instrument), 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

• Pi Recordings, a record label

Other arts, entertainment, and media

• P.I. (TV series), 2017 Singaporean TV series

• Pi magazine

• 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

• ∏, the symbol for maxterm notation in Karnaugh mapping

• Raspberry Pi, a single-board computer

Mathematics

• Π, a glyph representing the product of a sequence of terms

• Π0n, a set in the arithmetical hierarchy

• Π1n, 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

• πn(X), the nth homotopy group of X

• π-calculus, a process calculus

• Prime-counting function or π(x)

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. kit logo

• Linotype machine#Pi matrices or pi characters, uncommon characters used in typesetting

• Pali (ISO 639-1 language code "pi")

• Pi Day, an annual celebration of March 14 (3/14)'s relationship with the mathematical constant

See also

• PI (disambiguation)

• P (disambiguation)

• Pai (disambiguation)

• Pie (disambiguation)

• Pye (disambiguation)