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The Chi Rho, the Catacombs of Domatilla
This is the monogram of Christ, made up of two letters of the Greek alphabet: the X (pronounced “he”) and the P (“row”) superimposed on each other. They are the first two letters of the Greek word “Christos,” that is, Christ. This monogram, placed on a tomb, indicated that the deceased was a Christian. Even now, this symbol is very present in churches, especially on altars and tabernacles, and is often found on priestly vestments.
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