A badge is a piece of metal or cloth which you wear to show that you belong to an organization or support a cause. American English usually uses button to refer to a small round metal badge.
N-SING
標志；標記；象征
Any feature which is regarded as a sign of a particular quality can be referred to as a badge .
例句
Being a Communist was a badge of honour for thousands of trade union activists.對數千工會積極分子來說，成為共產黨員是榮譽的象征。