The Icon of Christ Pantocrator symbolizes triumph over heresy.
The Greek term “Pantocrator” conventionally means “Almighty” or “All-powerful”. The literal translation is “Ruler of All” or, figuratively, “Sustainer of the World”.
In this conception, Pantokrator is a compound word formed from the Greek for “all” and the verb meaning “to accomplish something” or “to sustain something”. This interpretation adds more to God’s actual power; i.e., God does everything (as opposed to God can do everything).
The very idea of Pantokrator is largely an Eastern Orthodox or Eastern Catholic theological conception. It is less developed in Western (Roman) Catholicism and largely unknown to most Protestants.
In the West a similar iconographic image is widely known as Christ in Majesty, but it developes a rather different iconography.