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What does PI mean?

Looking for the meaning or definition of the word PI? Here's what it means.

Abbreviation
  1. PiauĂ­, a state of Brazil.
Initialism
  1. Initialism of partial induction (see AI)
  2. Initialism of personal injury.
  3. Initialism of politically incorrect (see PC)
  4. Initialism of principal investigator (lead researcher on a grant-funded project)
  5. Initialism of Prison Industries (the prison-run work program for inmates)
  6. Initialism of private investigator.
  7. Initialism of pseudoincest.
  8. (biochemistry) Abbreviation of phosphatidylinositol (a phospholipid component of eukaryotic cell membranes, also abbreviated in PtdIns)
  9. (electronics) Initialism of power integrity.
  10. (informatics, SGML, XML) Initialism of Processing Instruction.
  11. (organic chemistry) Initialism of polyimide.
  12. (colloquial, Philippines) Initialism of the Philippines (PI standing for Philippine Islands)
  13. Abbreviation of prohibited immigrant.
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