What does PI stand for?

MLA style: "PI." Acronym Finder . 2012. AcronymFinder.com 11 Feb. 2012 http://www.acronymfinder.com/Piau%c3%ad-(Brazilian-state)-(PI).html
Chicago style: Acronym Finder . S.v. "PI." Retrieved February 11 2012 from http://www.acronymfinder.com/Piau%c3%ad-(Brazilian-state)-(PI).html
APA style: PI. (n.d.) Acronym Finder. (2012). Retrieved February 11 2012 from http://www.acronymfinder.com/Piau%c3%ad-(Brazilian-state)-(PI).html

Piauí (Brazilian state)

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