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Phi Sigma Kappa (ΦΣΚ), colloquially known as Phi Sig or PSK, is a men's social and academic fraternity with approximately 74 active chapters and colonies in North America. Most of its first two dozen chapters were granted to schools in New England and Pennsylvania, therefore its early development was strongly Eastern in character, eventually operating chapters at six of the eight Ivy League schools as well as more egalitarian state schools. It later expanded to the South and West.
According to its Constitution, Phi Sigma Kappa is devoted to the promotion of its three Cardinal Principles: the "Promotion of Brotherhood", the "Stimulation of Scholarship", and the "Development of Character".
Phi Sigma Kappa began on March 15, 1873 at Massachusetts Agricultural College in Amherst (now the University of Massachusetts Amherst) by six sophomores (referred to as The Founders). Phi Sigma Kappa merged with Phi Sigma Epsilon in 1985, which was the largest merger of Greek-letter fraternities.