Which two Greek letters are used to form the Labarum?

The Labarum is a significant Christian symbol that combines the Greek letters Chi (Χ) and Rho (Ρ). These letters are the first two letters of the Greek word for Christ, "Χριστός" (Christos), making the Labarum a profound representation of Christian faith. Historically, the Labarum was used by the Roman Emperor Constantine during his conversion to Christianity and has since become emblematic of Christendom.

By using Chi and Rho, the design cleverly intertwines spiritual meaning with visual representation, allowing followers of Christianity to see a direct connection between their faith and the emperor's authority. This symbol not only showcases the fusion of imperial power and religious belief but also highlights the conversion of the Roman Empire towards Christianity, which had a lasting influence on Western civilization.