Staurogram and apocalyptic letters in the Dome of Naples

Staurogram (tau-rho), also known as the monogrammatic, cross is a ligature composed of a superposition of the Greek letters tau (Τ) and rho (Ρ). Written alongside the Staurogram are the apocalyptic letters alpha and omega. Surrounding it is colorful designs of fruits and animals.

Staurogram and apocalyptic letters, mosaic of the dome of Naples in the baptistery of San Giovanni in Fonte, year 360 - 400 A.D.