Because Hermes was the god of medicine
The caduceus is a symbol of Hermes, the Greek god of trade, eloquence, and messenger of the gods. It consists of a winged staff with two entwined serpents, and is often used as a symbol of commerce and negotiation.
The staff of Hermes, known as the caduceus, is often associated with medicine due to its historical connection to commerce, negotiation, and balance, reflecting the dual nature of health and illness. Although the caduceus is frequently confused with the Rod of Asclepius, which is the true symbol of medicine, the caduceus has been adopted by various medical organizations, particularly in the United States. Its use in medicine symbolizes the pursuit of harmony and healing. Despite its mixed origins, the caduceus has become an enduring emblem in the medical field.
A Caduceus is a staff with entwining serpents running its length. In mythology some gods, notably Isis, Hermes, and Mercury are often portrayed holding a caduceus. It is also the symbol often (mistakenly) used for the modern medical profession.
The symbol of Asclepius is a serpent-entwined staff, known as the Rod of Asclepius. It is often used as the symbol of medicine and healthcare, representing healing and medical arts. The Rod of Asclepius is distinct from the caduceus, which is another symbol featuring a staff with two snakes.
Asclepius was the ancient Greek god of medicine.
The medical symbol of a snake coiled around a rod comes from ancient Greek mythology. Asclepius was the Greek deity associated with healing and medicine. The rod's formal name is the Rod of Asclepius.Note that there is only one snake coiled on the Rod of Asclepius. The staff surrounded by two snakes is mistakenly used for medical professions occasionally; this staff, called the caduceus is actually the staff carried by Hermes, the messenger of the gods and guide to the dead.
"Double engine snake" is vague, but I assume you're referring to the caduceus, the winged staff with the intertwined serpents. It's a mystery as to why that particular symbol is used in reference to the medical profession, since it is traditionally the symbol of Hermes, who was not the god of medicine. It is, however, vaguely similar in appearance to the rod of Asclepius (Asclepius being the god of medicine), though the rod of Asclepius has only one snake and the staff itself is a simple staff without wings. The simplest explanation is that someone without a grounding in classical education used the wrong symbol (most likely because he thought the version with two snakes and wings "looked cooler" and didn't realize it was actually a completely different symbol), and it somehow caught on.
It used to be a heralds wand; and Hermes was the god of heralds - being the herald and messenger of Zeus.
Apollo desired the flute, so Hermes bartered with Apollo and received his golden wand which Hermes later used as his heralds staff. (In other versions Zeus gave Hermes his heralds staff). (cite from http://www.pantheon.org/articles/h/hermes.html)
The symbol with two snakes wrapped around a staff is called the Rod of Asclepius, which is associated with healing and medicine in many cultures. It is often used as a symbol for healthcare organizations and professions.
the winged shoe He used to deliver messages. The caduceus or something, it's like a cane with two snakes entwined on it and wings coming out of the top. It is sometimes featured on the sides of ambulances because of Hermes' quickness. Actually, Hermes is also the patron god of doctors and all in medical professions, so the Caduceus is featured on ambulances because it represents medicine.
crosier