Christogram
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A Christogram is a monogram or combination of letters that forms an abbreviation for the name of Jesus Christ, traditionally used as a religious symbol within the Christian Church.
Chi-Rho symbol with Alpha and Omega on a 4th-century sarcophagus (Vatican Museums)
A IX monogram from a 4th century Sarcophagus from Constantinople
A Chi Rho combined with Alpha and Omega, in 1669 labelled Chrismon Sancti Ambrosii, Milan Cathedral
IHS Christogram embossed on an 1864 leather-bound King James Bible
IX monogram
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The IX monogram or XI monogram is a type of early Christian monogram, namely Christogram, looking like the Cyrillic letter Ж or the spokes of a wheel, sometimes within a circle.
Christogram
…which are the first two letters of the Greek χριστός, 'Christ'. It was displayed on the labarum military standard used by Constantine I in 312 AD. The IX monogram () is a similar form, using the initials of the name Ἰησοῦς (ὁ) Χριστός, 'Jesus (the) Christ', as is the ΙΗ monogram (), using the first two letters…
Intaglio with Chi and Iota, 190-300 AD, Swiss National Museum.
The 5th century Byzantine Column of Marcian displays the XI monogram inside a wreath.
Cover of Merovingian sarcophagus, Musée de Saint-Germain-en-Laye.