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The Greek letters X and P superimposed as a monogram of Christ.
Also known as: Chrismon, Labarum, X with a P on a grave
A P drawn through the centre of an X — chi and rho, the first two letters of Christos. Among the earliest Christian symbols, and firmly dated: Constantine adopted it in the early fourth century and the adoption is recorded by contemporaries.
Adopted by Constantine in the early fourth century and carried on the labarum, the imperial standard — one of the few early Christian symbols whose adoption is recorded by contemporary writers rather than inferred.
Early 4th century
Frequently flanked by alpha and omega on monuments and in church decoration, the three read together as Christ the beginning and the end.
A diagonal cross in the shape of an X with an upright stroke through its centre, the upright topped by a closed loop like the letter P.
Both are christograms — monograms of the name or title of Christ.
The Chi-Rho is conventionally flanked by alpha and omega.