rosette
noun [ C ] uk/rəʊˈzet/ us/roʊˈzet/
（支持某政党或某球队的人佩戴或者授予比赛胜利者的）玫瑰花结，玫瑰形饰物
a flower-shaped decorative object cut into wood or stone, or one made of ribbon (= narrow cloth strips) worn as a sign that you support a particular team or political party or that you have won a race, etc.
The winning horse had a rosette fastened to its bridle. 获胜的赛马笼头上系了一个玫瑰花结。