In Christian art the tetramorph is the union of the symbols of the Four Evangelists, the four living Creatures derived from the Book of Ezekiel, into a single figure or, more commonly, a group of four figures.
Each of the four Evangelists has a creature, usually shown with wings: St Matthew the man or angel, St Mark the lion, St Luke the ox or bull, and John the eagle.
In Christian art and iconography, Evangelist portraits are often accompanied by tetramorphs, or the symbols alone used to represent them.
Evangelist portraits that depict them in their human forms are often accompanied by their symbolic creatures, and Christ in Majesty (Pantokrator) is often shown surrounded by the four symbols.
Here you have some examples: