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Delta Delta Delta (ΔΔΔ), also known as Tri Delta and Tri-Delt, is an international sorority founded on November 27, 1888 at Boston University by Sarah Ida Shaw, Eleanor Dorcas Pond, Isabel Morgan Breed and Florence Isabelle Stewart.
Tri Delta partnered with St. Jude Children's Research Hospital in 1999 and was the first non-corporation partner to be named the St. Jude partner of the year. With over 200,000 living initiates, Tri Delta is one of the largest National Panhellenic Conference sororities.