Brass knuckles are a kind of weapon used when fighting bare-handed. In Hong Kong they're a prohibited weapon. Taking brass knuckles with you when you go out is against the law, and you can be imprisoned for three years.
鐵蓮花係一種徒手搏擊時用嘅武器，喺香港係違禁武器，你出街帶咗鐵蓮花係犯法嘅，可判監三年。