. . "The Chi Rho (/\u02C8ka\u026A \u02C8ro\u028A/) is one of the earliest forms of christogram, and is used by some Christians. It is formed by superimposing the first two (capital) letters chi and rho (\u03A7\u03A1) of the Greek word \"\u03A7\u03A1\u0399\u03A3\u03A4\u039F\u03A3\" = Christ in such a way to produce the monogram."@en . . .