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The Chi Rho (/ˈkaɪ ˈroʊ/; also known as chrismon or sigla) is one of the earliest forms of christogram, formed by superimposing the first two (capital) letters-chi and rho (ΧΡ)-of the Greek word ΧΡΙΣΤΟΣ (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 (r. 306-337) as part of a military standard (vexillum). Constantine's standard was known as the Labarum. Early symbols similar to the Chi Rho were the Staurogram (Christliche Symbolik (Menzel) I 193 2.jpg) and the IX monogram (Christliche Symbolik (Menzel) I 193 4.jpg). In pre-Christian times, the Chi-Rho symbol was also to mark a particularly valuable or relevant passage in the margin of a page, abbreviating chrēston (good). Some coins of Ptolemy III Euergetes (r. 246-222 BC) were marked with a Chi-Rho. Although formed of Greek characters, the device (or its separate parts) are 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. The Chi Rho symbol has two Unicode codepoints: U+2627 ☧ Chi Rho in the Miscellaneous symbols block and U+2CE9 ⳩ Coptic symbol Khi Ro in the Coptic block.