A key icon tradition is that of Jesus, Christ, Pantocrator.

Pantorcrator means "ruler of all" (pan - all, crator - ruler, as in demo-crator, democracy, rule of the people). It is sometimes translated "almighty" as in the Revelation 1:8 verse on the last page.

The term is used often in Revelation, such as at 4:8 "And the four living creatures, each of them with six wings, are full of eyes all around and inside. Day and night without ceasing they sing, '"Holy, holy, holy, the Lord God the Almighty [pantocrator], who was and is and is to come.'"

In Orthodox churches, you typically see an icon of Jesus Christ Pantocrator painted at the top of the central dome of the church.

This particular icon is from the Russian Orthodox tradition.