What is the significance of the two-barred cross symbol in Christian iconography?

The two-barred cross symbol, also known as the Patriarchal cross, is significant in Christian iconography as it represents the crucifixion of Jesus Christ. The upper bar symbolizes the sign that Pilate placed on the cross, which read "Jesus of Nazareth, King of the Jews," while the lower bar represents the footrest of the cross. This symbol is often associated with the Eastern Orthodox Church and is used to signify the dual nature of Christ as both human and divine.