Gunshot wound

Sounds trivial but that's all there is to it. A wound is a defect in the skin, many causes, obviously. Wounds from a bullet, pellet, piece of shrapnel, knife or even the end of a broken bone would be called penetrating wounds. There are other wounds not due to penetration, such as abrasions, wounds from poor blood supply, radiation, chemicals, burns, frostbite or irritation from moisture, etc