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Meanings and definitions for PI
What does PI stand for? What does PI mean?
- Politically Incorrect (blog), a German political blog
- Seattle Post-Intelligencer or P-I, a newspaper in the United States
- Primitive Instinct, an English rock band formed in 1987
- Partido Independiente or Independent Party, a political party in Uruguay
- Partido Intransigente or Intransigent Party, an Argentine political party
- Partit per la Independència, a political party in Catalonia (Spain) of the 1990s
- Perimeter Institute for Theoretical Physics, a research centre in Ontario, Canada
- Privacy International, a UK-based charity that supports the right to privacy across the world
- Defunct Piedmont Airlines (1948–89) (IATA airline code PI)
- Philadelphia International, record label founded in 1971.
- Parental investment, in evolutionary biology
- Paternity Index, a value used to calculate probability of paternity
- Pistillata, a gene that influences the development of flowers in the ABC model of flower development
- Phosphatidylinositol, a class of lipids
- Ponderal index, a measure of leanness of a person (similar to body mass index)
- Propidium iodide, a chemical used as a DNA stain
- Primary immunodeficiency
- 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
- Pulsatility index, a ratio of blood flow rates
- Persistent identifier, a long-lasting reference to a digital object
- Processing Instruction, an SGML and XML node type
- Programmed instruction, a technology invented to improve teaching
- Provider-independent address space, a type of internet (IP) address
- Isoelectric point, the pH at which a particular molecule or surface carries no net electrical charge.
- Power integrity, in digital electronics
- PI controller, a concept in automation and control engineering
- Plasticity index, a measure of the plasticity of a soil
- Polyimide, a polymer of imide monomers
- Principal investigator, the lead scientist or engineer for a particular project
- Pass interference, a foul in American and Canadian gridiron football
- People's Initiative, one of the modes in which the constitution of the Philippines could be amended
- Philippine Islands, the commonly used name of the Philippines during the US colonial period
- Pirot, a city located in south-eastern Serbia (license plate code PI)
- Political incorrectness or politically incorrect, commonly abbreviated to PI or PIC
- Pro forma invoice, in business
- Private investigator, a person who can be hired to undertake investigations
- Profitability index, the ratio of payoff to investment of a proposed project
- Personal injury
- Pi (letter), a Greek letter
- 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
- Pi de Bruijn (born 1942), Dutch architect
- Pi Schwert (1892-1941), American baseball player and politician
- Pi Vèriss, Dutch songwriter and composer
- 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
- 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
- Pi (film), a 1998 film directed by Darren Aronofsky
- 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
- 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
- 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
- ∏, the symbol for maxterm notation in Karnaugh mapping
- Raspberry Pi, a single-board computer
- 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
- ΠPi, 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
- πn(X), the nth homotopy group of X
- π-calculus, a process calculus
- Prime-counting function or π(x)
- Pion or π, a subatomic particle
- 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
- Perlite Institute
- Personal Injuries , MVA with or without PI (motor vehicle accident with, or without, personal injuries)
- Principal/Private Investigator
- Principle Investigator
- Program Interruption
- Protocol Interpreter
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