Chi Rho Christogram Greek Apparel & Merchandise. The Chi Rho is one of the earliest forms of christogram, formed by superimposing the first two lettersóchi and rho of the Greek word Christos in such a way that the vertical stroke of the rho intersects the center of the chi. The Chi-Rho symbol was used by the Roman Emperor Constantine I as part of a military standard. Constantine's standard was known as the Labarum. Early symbols similar to the Chi Rho were the Staurogram and the IX monogram. Although formed of Greek characters, the device is frequently found serving as an abbreviation in Latin text, with endings added appropriate to a Latin noun, thus XPo, signifying Christo, "to Christ", the dative form of Christus.

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