Symbol: Holy Spirit is definitely the symbol of the Holy Orders because Holy Spirit is same as God. Pope Francis is with Holy Spirit in this picture and this absolutely symbolize that the Pope is with God and blessed by God.
Thou shalt have no other gods before me. Thou shalt not make unto thee any graven image, or any likeness of any thing that is in heaven above, or that is in the earth beneath, or that is in the water under the earth. -Exodus 20:3-6 Ye shall make you no idols nor graven image, neither rear you up a standing image, neither shall ye set up any image of stone in your land, to bow down unto it: for I am the Lord your God. - Leviticus 26:1