Sigma Gamma Rho Sorority, Inc. (ΣΓΡ) is a historically African American sorority, international collegiate, and non-profit community service organization that was founded on November 12, 1922, by seven educators on the Irvington campus (1875–1928) of Butler University in Indianapolis, Indiana. It was incorporated within Indiana in November 1922 and became a national collegiate sorority on December 30, 1929, when a charter was granted to the Alpha chapter. Sigma Gamma Rho is the only sorority of the four historically African American National Pan-Hellenic Council sororities established at a predominantly white institution instead of at Howard University. The sorority's slogan is "Greater Service, Greater Progress".