An eagle, or a symbol representing an eagle, especially the Roman military standard shaped like an eagle.
From Latin 'aquila' meaning eagle, used by Romans to represent their legion's symbol and honor; the word evolved through medieval Latin to refer to heraldic eagle symbols.
Roman soldiers were so devoted to their aquila standards that losing one in battle was considered the ultimate shame—entire armies would fight desperately to recover it. That's why 'aquila' became such a powerful symbol of military power.
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