Constantine the Great painted the Greek letters khi and rho, the first two letters of the title “Christ ” in Greek, on his soldiers ’ shields in hopes of protecting his soldiers in battle.
وَمَا يَلْفِتُ ٱلِٱنْتِبَاهَ بِشَأْنِ هذِهِ ٱلْوَاقِيَةِ وُجُودُ ٱلِٱسْمِ يَهْوَهَ بِٱلسُّوَيْدِيَّةِ بِحُرُوفٍ بَارِزَةٍ .‏