The serpent and staff in the symbol portray the staff of Asclepius, an ancient Greek physician deified as the god of medicine. Overall, the staff represents medicine and healing, with the skin-shedding serpent being indicative of renewal.”
Why is there a snake symbol on ambulances?
 The symbol originated when Mercury once attempted to stop a fight between two snakes by throwing his rod at them, whereupon they twined themselves around the rod, and the symbol was born. [2,8,9] The Rod of Asclepius belongs to Aesculapius, who was the revered Greek god of healing.
Can anyone use the Star of Life?
States and federal agencies that are involved in emergency medical services are authorized to permit use of the star of life as such: 1.) As a means of identification for medical equipment and supplies for installation and use in the emergency medical care vehicle — the ambulance.