You'll most likely come across the word auricle in an anatomy textbook, since it's a scientific term for a body part. It's more common to call an ear pinna, or the external part of the ear, an auricle, although it's occasionally also used to refer to an atrium of the heart. The word comes from the Latin auricula, "ear," with the heart meaning stemming from the ear-like shape of the heart's upper chambers.