So what does this emblem represent?

The blue globe represents the international nature of the patients which make up this practice. Overlying this there is the Caduceus, symbolic staff surmounted by two wings and entwined with two snakes. Among the ancient Greeks the caduceus was carried by heralds and ambassadors as a badge of office and a mark of personal inviolability, because it was the symbol of Hermes, the messenger of the gods. According to Book IV of Virgil's Aeneid, the Greek god Apollo gave the staff to Hermes in return for the lyre.

In Roman mythology the symbol is associated with the god Mercury.

see Giambologna's sculpture . Or better still see the real thing in the Bargello four minutes walk from the office.

The staff of Asclepius, the Greek god of healing, which was entwined by a single snake, was also called a caduceus. The caduceus has been adopted as a symbol by the medical profession; it is also the emblem of the medical branches of the United States Army and Navy.

Asclepius, in Greek mythology, the god of medicine. He was a son of the god Apollo and Coronis, a beautiful maiden of Thessaly. Angry because Coronis was unfaithful to him, Apollo killed her and took his infant son to the centaur Chiron to be raised. Asclepius learned all that Chiron knew about the art of healing and soon became a great physician. Because he committed the unpardonable sin of raising a man from the dead, the god Zeus killed him with a thunderbolt. For hundreds of years after his death, the sick visited the many temples built in his honour. There they offered sacrifices and prayed to Asclepius, who, they believed, would come to them in dreams and prescribe cures for their illnesses.