The Greek word Pantocrator literally means “he who has authority over everything.”

That’s how two Hebrew expressions used in the Old Testament to describe God, the “God of Hosts” (Sabaot) and “Almighty” (El Shaddai), were translated into Greek. In order to represent such mighty qualities, Byzantine iconographers made use of features, such as an open right hand, that could convey a sense of power and authority. This image is the oldest known example of “Christ Pantocrator” in the world. The different expressions shown on the right and left sides of Jesus’ face may suggest his double nature as both human and divine. It was painted on a wooden board during the 6th or 7th century and is currently preserved at the Monastery of St. Catherine on Mount Sinai, in Egypt, one of the oldest monasteries in the world.
Source & image: Aleteia.org

Also if you put a mirror down the middle of the image, you can get two different images. There have been many interpretations of this, but some suggest the left is the Jesus offering an outstretched hand in a gesture of ‘Peace’, the other as the ‘Just Judge’. However many scholars disagree with this interpretation suggesting it came much later and that the original “asymmetry” was the result of the style of the period, and meant to convey both the Divinity and Humanity of Christ.
Source & image: Inspiraggio.