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Pi Beta Phi (ΠΒΦ), often known simply as Pi Phi, is an international women's fraternity founded at Monmouth College, in Monmouth, Illinois on April 28, 1867 as I.C. Sorosis, the first national secret college society of women to be modeled after the men's Greek-letter fraternity.
Pi Phi's headquarters are located in Town and Country, Missouri. Since its founding, the fraternity has installed over 200 chapters and more than 300 alumnae organizations across the United States and Canada. Most of the fraternity's official philanthropies fall under the category of education/literacy programs or the preservation of traditional arts and crafts. Pi Beta Phi is one of 26 national sororities which are members under the umbrella organization of the National Panhellenic Conference.