Chi-Rho Monogram
The Greek letter X (chi) transposed over the letter P (rho). The Chi-rho monogram was a popular emblem from early Christianity for the name of Christ and is thought to have derived from the contraction of chi and rho into Chr, the first three letters in Christ. Also known as the Labarum (standard) of Constantine because of the prominence of the monogram on the standard.
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This page is adapted from the Glossary at Phoenixmasonry — Used with permission.