A tetramorph (Greek, four shape) were four angelic beings depicted twice in the Bible.

"the four had the face of a human being, the face of a lion on the right side, the face of an ox on the left side, and the face of an eagle"
Ezekiel 1:10
"the first living creature like a lion, the second living creature like an ox, the third living creature with a face like a human face, and the fourth living creature like a flying eagle."
Revelation 4:7
"Matthew is the man because he begins with a genealogy; Mark is the lion, roaring in the desert with prophetic power; Luke is the ox, because he begins with temple sacrifice; and John is the eagle, flying heavenwards like the divine Word."
St Jerome, 347-420