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Beta Sigma Psi National Lutheran Fraternity (ΒΣΨ), commonly known as Beta Sig is a United States-based fraternity for Lutheran men. Founded at the University of Illinois in 1925, ΒΣΨ has more than 7,500 initiated members. With 10 chapters and colonies in 7 states, there are currently over 300 undergraduate members. Beta Sigma Psi is centered on three S's: Spiritual, Scholastic, and Social.