Zeta Psi (ΖΨ) is a collegiate fraternity. It was founded in June 1, 1847 at New York University. The organization now comprises fifty-three active chapters and thirty-four inactive chapters, encompassing roughly fifty thousand members, and is a founding member of the North American Interfraternity Conference. The motto is "ΤΚΦ" in Greek, rendered in English as "Tau Kappa Phi", "TKP", or "TKPhi". Zeta Psi's headquarters is located in Pearl River, New York.