PinMart Certified Nursing Assistant Caduceus Blue CNA Lapel Pin Available as a single item or bulk packed. Select your quantity above. Qty: 1 pin Check out this beautifully designed Blue Certified Nursing Assistant Caduceus Pin. CNA is proudly stated in blue enamel on a 3-D 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. SIZE: 1" Each pin comes with a clutch back and is individually poly bagged.