Pi (disambiguation)

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Pi ( $π$ ) 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

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

Stage name

Pi (entertainer), American drag performer

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), 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

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

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
$Π 0 n$ , a set in the arithmetical hierarchy
$Π 1 n$ , 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 $n$ th homotopy group of $X$
Π_n(X), the fundamental n-groupoid of X
- $Π(X)$ , the fundamental groupoid of $X$
$π n (X)$ , the $n$ th cohomotopy set of $X$
$π n$ , a notation for the scalar projection onto the n-th component
$π$ -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