Caduceus as a symbol of medicine a review of 257 of the works bearing this printer's device only one was related to medicine. Similar use of the caduceus in printers' marks continues to the present day, with companies including F. A. Davis Company still using the symbol as an element of their insignia. There are a few other examples of use in this period. It may have been used as a symbol by Sir William Butts, physician to Henry VIII. Similarly, physician John Caius, founder of Caius College, Cambridge, and at the time President of the Royal College of Physicians, during official visits to his eponymous
Planet symbols 🌕) and "waning" (U+263E ☾). The symbol for Mercury(U+263F ) is ultimately derived from the caduceus, or intertwined serpents, which were the main attribute of Mercury/Hermes throughout antiquity. The caduceus was usually shown with at least three loops, but this was simplified to a single loop in the diagram of Kamateros (12th century). The modern symbol has also been interpreted as representing the god's winged headdress. The Venus symbol (♀) consists of a circle with a small cross below it. It originates in Late Antiquity as an astrological symbol for the planet Venus (associated with the goddess Venus), and hence