Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
A symbol resembling the Greek letter tau or T. The standard raised by Moses to elevate the brazen serpent, and the mark made by the Israelites in blood on their doorpost is thought to have been the tau. The tau cross is also the emblem of St. Anthony of Egypt.