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Sigma Pi Sigma exists to honor outstanding scholarship in physics, to encourage interest in physics among students at all levels, to promote an attitude of service, and to provide a fellowship of persons who have excelled in physics. Election is a lifelong membership and includes a once-year complimentary membership in the Society of Physics Students (SPS).
Sigma Pi Sigma is an organization of the American Institute of Physics, and a member of the Association of College Honor Societies. Founded in 1921, there are more than 90,000 historical members.