Pi (disambiguation)

Pi, or π, is the mathematical constant equal to a circle's circumference divided by its diameter.

Pi may also refer to:

Letter Pi (π)

Lower-case π

• Pi (letter), the Greek letter
• Lowercase π:
  • π (film), a 1998 film directed by Darren Aronofsky.
  • $\pi (x)\,\!$ (pi function), the prime-counting function
  • π_n(X) the n-th homotopy group of X.
  • Pi bond
  • Osmotic pressure
  • A song from the Kate Bush album Aerial
  • Shorthand for pion
  • A men's fragrance from Givenchy
  • The symbol for political life used in Boethius' Consolation of Philosophy
• Uppercase Π:
  • The product symbol
  • $\Pi (x)\,\!$ (Pi function), the Gamma function when offset to coincide with the factorial
    • $\pi (x)\,\!$, the reciprocal of the Pi function

Pi as a word

• Pi (instrument)
• Pi (.hack), a fictional character from the multimedia franchise .hack//G.U.
• Pi Magazine
• Pi Recordings, a record label
• "Pi", a song from the Hard 'n Phirm album Horses and Grasses, which the song ends at 3:14
• Pi, a member of Team Robo in Sega Soccer Slam
• Pi, a fictional character in the novel Life of Pi
• Pi County, county in Sichuan, China

PI as an abbreviation

Science

• Primary immunodeficiency
• An inorganic phosphate group (as P_i)
• The isoelectric point (as pI)
• Phosphatidylinositol
• Propidium iodide
• Predictive Index
• Polyimide
• Potential instability
• Protease inhibitor
• Pistillata a gene that influences the development of flowers in the ABC Model of Flower Development

Companies and organizations

• Parents for Inclusion
• Perimeter Institute for Theoretical Physics
• Piedmont Airlines (1948-1989)
• Privacy International
• Pasteur Institute
• Sun Air (Fiji) (IATA airline code: PI)

Professional occupations

• Photographic interpreter, an aerospace and strategic reconnaissance term
• In legal shorthand, it refers to a Plaintiff
• Principal investigator
• Private investigator

Computing

• Page impressions, an online advertising term
• Pebi, a Binary prefix
• Programmed instruction
• Provider Independent Address Space

Other

• Pass interference in American football
• Parameter indicator, in ISO standards
• People's Initiative
• Personal injury
• The Philippines (from "Philippine Islands")
• Public intoxication
• Seattle Post-Intelligencer
• Philippine Idol
• Primitive Instinct
• Proforma invoice
• Plasticity Index

See also

• P
• Pie (disambiguation)

PI

Also a nickname for someone named Polly that farts.