What does PI stand for?

MLA style: "PI." Acronym Finder . 2013. AcronymFinder.com 22 May. 2013 http://www.acronymfinder.com/Pulse-Inverter-(PI).html
Chicago style: Acronym Finder . S.v. "PI." Retrieved May 22 2013 from http://www.acronymfinder.com/Pulse-Inverter-(PI).html
APA style: PI. (n.d.) Acronym Finder. (2013). Retrieved May 22 2013 from http://www.acronymfinder.com/Pulse-Inverter-(PI).html

Pulse Inverter

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Protocol Interpreter Provider Independent (IP address space assigned by IANA) Proyectos Industriales Psicología Integrada (Portugese) Psykoterapiinstitut (Stockholm, Sweden) Public Information Public Intoxication (law enforcement) Pulmonary Infection (lungs) Pulsatility Index Pulse Induction		Punto Informatico Purchasing Instruction Pursuit Inc. Pusat Informasi (Indonesian: Information Center) Pi Kappa Phi (fraternity) Politically Incorrect Private Investigator (Saturday Night Live) Pilot Report (also seen as PIREP, without the space) Piping and Instrumentation Diagram Parainfluenza Virus Type 3 Pacific Islands Global Ocean Observing System