Pi (disambiguation)

Pi ($\pi$) 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

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

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 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

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
 * $π_{n}(X)$, the $n$th homotopy group of $X$
 * π-calculus, a process calculus
 * Prime-counting function or $π(x)$
 * $$\pi$$, 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