Sigma Nu (ΣΝ) is an undergraduate college fraternity founded at the Virginia Military Institute on January 1, 1869. The fraternity was founded by James Frank Hopkins, Greenfield Quarles and James McIlvaine Riley shortly after Hopkins witnessed what he considered a hazing ritual by upperclassmen at the Virginia Military Institute. The fraternity's existence remained secret until the founders publicly announced their new society on January 1, 1869. Since its founding, Sigma Nu has more than 279 active and inactive chapters and colonies across the United States and Canada and has initiated more than 227,000 members. Sigma Nu, Kappa Alpha Order and Alpha Tau Omega make up the Lexington Triad.
The fraternity's values are summarized as an adherence to the principles of love, honor, and truth. Because of its military heritage, Sigma Nu retains many military trappings in its chapter ranks and traditions, and places importance on the concept of personal honor. In 1945, William Yates (University of Pennsylvania) inspired the formation of the "Sigma Nu Inc., Educational Foundation". Its name was changed to the "Sigma Nu Educational Foundation, Inc." The foundation assists collegiate members with financial aid supplements, and the fraternity in the development of a leadership program.