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Sigma Tau Delta (ΣΤΔ) is an international excelled English honor society for students of English at four-year colleges and universities who are within the top 30% of their class and have a 3.5 GPA or higher. It presently has over 850 chapters in the United States and abroad. The organization inducts over 9,000 new members annually, and is the largest honors organization in its field and one of the largest members of the Association of College Honor Societies (ACHS). The Society's central office is located at Northern Illinois University in DeKalb, Illinois.