Brass knuckles are a type of hand weapon often used for self-defense. They are made of brass or other hard materials and are worn over the knuckles. The term brass knuckles has also been used to describe other types of hand weapons that are similar to brass knuckles. Some synonyms for brass knuckles include knuckle dusters, knuckledusters, knuckle busters, brass knuckle knife, and knuckles. These types of weapons have been banned in many countries because of their dangerous nature. Therefore, it is essential to avoid their use and to seek safer alternatives for self-defense.