Physicians Assistant (PA) Caduceus Pin. PA 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 and medical associations. These pins are perfect for presentation at graduation, as a gift for your PA team or for a medical conference! Each pin includes a clutch back and is individually poly bagged.