BADGE

[noun] [C] - a small piece of metal, plastic, cloth, etc., with words or a picture on it, that is pinned or sewn to your clothing, often to show your support for a political organization or belief, or your rank, or membership of a group, etc.She wore a T-shirt covered in badges.At the meeting, we all had to wear badges with our names on.He was wearing a badge that said 'You can't hug a child with nuclear arms'.For Tony, owning a Mercedes was a badge of success (= showed that he was successful).