Pi (disambiguation)
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Look up pi, PI, π, or Π in Wiktionary, the free dictionary. |
Pi or π is a mathematical constant equal to a circle's circumference divided by its diameter.
Pi, PI, π or Π may also refer to:
- Pi (letter), a Greek letter
Music
- Pi (instrument), a variety of quadruple reed oboes used in the traditional music of Thailand
- Pi Recordings, a record label
- "π", a song by Kate Bush from her album Aerial
- "Pi", a song by Hard 'n Phirm from their album Horses and Grasses
Science
- Pi bond, a chemical bond
- Pion or π, a subatomic particle
- Osmotic pressure or Π
- π, a measure of nucleotide diversity
Mathematics
- Prime-counting function or π(x)
- π-calculus, a process calculus
- ∏, a glyph representing the product of a sequence of terms
- πn(X) the nth homotopy group of X
- Π(x) (Pi function), the Gamma function when offset to coincide with the factorial
- π(x), the reciprocal of the Pi reciprocal
-
, a set in the arithmetical hierarchy -
, a set in the analytical hierarchy -
, a set in the polynomial hierarchy
Pi as a word
- Raspberry Pi, a Single Board Computer
- Pi (.hack), a fictional character from the multimedia franchise .hack//G.U.
- Pi Magazine
- Pi County in Sichuan, China
- Pi (film), a 1998 film directed by Darren Aronofsky
- Pi Studios, a video game developer
- Pi (state) a vassal state in Zhou Dynasty China (1046–256 BCE)
- Pi, a member of Team Robo in Sega Soccer Slam
- Pi, a fictional character in the novel Life of Pi
- Pi Islands
- Pi matrices, uncommon characters on a linotype machine
PI as an abbreviation
Science
- Parental Investment in biology
- Primary immunodeficiency
- Principal investigator
- Pulsatility index of blood flow
- An inorganic phosphate group (as Pi)
- The isoelectric point (as pI)
- Phosphatidylinositol
- Propidium iodide
- Polarity item in linguistics
- Polyimide
- Ponderal index
- Protease inhibitor (pharmacology), class of drugs used to treat or prevent infection by viruses, including HIV and Hepatitis C
- Protease inhibitor (biology), molecules that inhibit the function of proteases
- Pistillata a gene that influences the development of flowers in the ABC model of flower development
- Prediction interval in statistics
- Paternity Index
Companies and organizations
- Parents for Inclusion
- Perimeter Institute for Theoretical Physics
- Privacy International
- Pasteur Institute
- Sun Air (Fiji) (IATA airline code: PI)
Political parties
- Independent Party (Uruguay) (Spanish: Partido Independiente)
- Intransigent Party (Spanish: Partido Intransigente), Argente political party
Professional occupations
- Photographic interpreter, an aerospace and strategic reconnaissance term
- In legal shorthand, it refers to a plaintiff
- Personal injury attorney
- Principal investigator, the lead scientist in a project
- Private investigator
Computing
- Pebi, a Binary prefix
- Persistent identifier (PI), a long-lasting reference to a digital object
- Programmed instruction
- Provider-independent address space
- Processing Instruction, SGML and XML node type
- Pali language's ISO 639-1 language code
Other
- Pirot, a city in Serbia (license plate code)
- Pass interference in American football
- Parameter indicator, in ISO standards
- People's Initiative
- Profitability index
- Personal injury
- The Philippines (from "Philippine Islands")
- PI controller, a concept in automation and control engineering
- Piauí, a state in Brazil
- Poison Idea, American hardcore punk band
- Politically Incorrect (blog), a German political blog
- Public intoxication
- Seattle Post-Intelligencer
- Philippine Idol
- Primitive Instinct
- Plasticity index
- Marine Corps Recruit Depot Parris Island
- Partit per la Independència, a short lived political party in Catalonia of the 1990s
See also
- P (disambiguation)
- Pie (disambiguation)
- Pai (disambiguation)
- Pye (disambiguation)
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