The eagle is used in heraldry as a charge, as a supporter, and as a crest. Sometimes just the headless body ("sans head" eagle) or the head replaced with another symbol, as well as parts of the eagle, such as its head, wing or leg, are used as a charge or crest.
The eagle with its keen eyes symbolized perspicacity, courage, strength and immortality, but is also considered "king of the skies" and messenger of the highest Gods. With these attributed qualities the eagle became a symbol of power and strength in Ancient Rome. Mythologically, it has been connected by the Greeks with the God Zeus, by the Romans with Jupiter, by the Germanic tribes with Odin, by the Judeo-Christian scriptures with those who hope in God (Isa 40:31), and in Christian art with Saint John the Evangelist.