CAA: Christian Anime Alliance

The Chi Rho is one of the earliest christograms used by Christians. It is formed by superimposing the first two letters in the Greek spelling of the word Christ ( Greek : "Χριστός" ), chi = ch and rho = r, in such a way to produce the monogram ☧. The Chi-Rho symbol was also used by pagan Greek scribes to mark, in the margin, a particularly valuable or relevant passage; the combined letters Chi and Rho standing for chrēston, meaning "good."[1]
Although not technically a cross, the Chi Rho invokes the crucifixion of Jesus as well as symbolizing his status as the Christ. There is early evidence of the Chi Rho symbol on Christian Rings of the third century.