#16 Ad Crucem Christmon - ChiRho Cornerstone
The Chi Rho 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.
This Christmon also reminds us that Christ is the Stone that the builders rejected, Who has become the chief cornerstone.
Psalm 118:22-23, “The stone which the builders rejected has become the cornerstone; the LORD had done this, and it is marvelous in our eyes.”
Jesus said to them, “Have you never read in the Scriptures: “‘The stone that the builders rejected has become the cornerstone; this was the Lord's doing, and it is marvelous in our eyes’? (Matt 21:42)