PinMart Medical Doctor MD Gold Caduceus Pin Available as a single item or bulk packed. Select your quantity above. 5 Pack of Lapel Pins Medical Doctor (MD) Caduceus Pin. MD is proudly stated in black enamel on this 3D gold plated Caduceus. The caduceus is frequently used by the medical field, military medics and has become the unofficial symbol of medical professionals. SIZE: 1" Each pin comes with a clutch back and is individually poly bagged.