The shape of the snake sword on the ambulance represents the emergency medical rescue service system, and it is called the "star of life", also known as the "snake emblem" and "snake-wrapped crutch".
The logo was originally patented by the American Medical Organization (AMA) (1967), and was "transferred" to NHTSA, becoming the logo of its subordinate emergency service organization (EMS). Dawson Mills of the US Department of Transportation asked the American Red Cross to provide the EMSS ambulance with the Red Cross logo, but it was rejected.
The origin of the snake emblem:
It turns out that thousands of years ago, human beings knew the medicinal value of poisonous snakes, collected them purposefully, refined them into drugs, and used them to cure diseases and save lives. In the works of ancient Roman painters and artists, there are almost scenes depicting the god of health feeding snakes with cups in his hands. Whether in real life or in artistic creation, snakes have an indissoluble bond with medicine.
Therefore, since the Middle Ages, pharmacies in European countries began to show this sign. Snakes symbolize the ability to save human beings, and goblets represent the tools for human beings to collect snake venom. The snake is wrapped around a crutch, which is a symbol and symbol of medicine. People call it the snake emblem.