The Celtic cross is a symbol that combines the Christian cross with a circle, representing the intersection of Christianity and Celtic traditions. It features a vertical and horizontal beam intersecting a circular ring, often adorned with intricate knotwork or other Celtic designs. The ☘️✝️ emoji could be used to represent the Celtic cross, as the shamrock (☘️) is a well-known Irish symbol associated with the Celtic culture, while the cross (✝️) represents Christianity.