Symbolism?

Christ is God, the Creator of the universe and wields supreme power over all things.

Christ is our Redeemer, He purchased us by His precious Blood, and made us His possession. 

Christ is Head of the Church.

God bestowed upon Christ the nations of the world as His special dominion.

Jesus’ replied to Pilate, "My kingdom is not of this world .... I was born for this, and for this I came into the world, to witness to the Truth. The one who is of the Truth hears my voice". As Pilate demonstrates, not everyone can hear that voice. But those who do hear it can be in no doubt that it is the voice of God; and that is why we call Christ our King.