or '''pi''' may refer to:
- Pi , the mathematical constant equal to a circle's circumference divided by its diameter.
- Pi (letter) , the Greek letter π or Π:
- --- used in lowercase:
-- to represent the mathematical constant above.
-- as π(x) , to indicate the prime counting function.
-- as shorthand for Pion , a meson particle.
-- as the name of a men's fragrence from Givenchy .
-- to represent Osmotic Pressure
- --- used in uppercase:
-- as a technical symbol.
-- as Multiplication , Π(x) to indicate the product or mutipliction series.
- Pi Bond (π bond) in chemistry.
- Pi (film) , a film by Darren Aronofsky .
- Pi Magazine , the student rag of University College London.
- Isoelectric Point , pI, isoelectric point.
- Life Of Pi , a novel by Yann Martel.
- Pi , latin symbol for the political life. See also Boethius ' '' Consolation Of Philosophy ''
- '' Pi '' is the generic term for any of a variety of quadruple reed oboes used in the traditional music of Thailand
- Parents For Inclusion , an organisation in the United Kingdom , often abreviated to Pi.
- Pi-calculus , a formalism used in Computer Science to reason about parallel computation.
- Pi, an abbreviation for the IEEE prefix pebi which represents 250.
may stand for:
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