- a venomous snake, Agkistrodon (Ancistrodon) contortrix, of the eastern and southern U.S., having a light-brown to copper-red body marked with darker bands.
- an extremely venomous but sluggish snake, Denisonia superba, of Australia and Tasmania, having a reddish to black body, depending on the region.
- Copperhead,
- a Northern Democrat who opposed the Civil War, advocating peace and restoration of the Union even if slavery continued.
- a finned, 155 mm cannon-launched U.S. Army artillery shell that homes on the target, using the reflection of a laser beam projected by a forward observer.
- a venomous reddish-brown snake, Agkistrodon contortrix, of the eastern US: family Crotalidae (pit vipers)
- a venomous reddish-brown Australian elapid snake, Denisonia superba
- a Yankee supporter of the South during the Civil War
