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
标志;标记;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.对数千工会积极分子来说,成为共产党员是荣誉的象征。