Pi (disambiguation)

Pi or ${\displaystyle \pi }$ is a mathematical constant equal to a circle's circumference divided by its diameter.

Pi, π or Π may also refer to:

• Pi (letter), a Greek letter

Places

• Pi (state), an ancient state during China's Zhou 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 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, a character in the 2006 animated film Shark Bait and the 2012 sequel The Reef 2: High Tide

Films

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

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, 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_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

• ∏, 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
• Π⁰
  _n, a set in the arithmetical hierarchy
• Π¹
  _n, a set in the analytical hierarchy
• Π^P
  _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
• π_n(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)