guidon
/ˈgaɪdən/noun
- a pennant that narrows to a point or fork at the free end, especially one used as the standard of a light cavalry regiment（常为细长三角形或燕尾状的）小旗; （尤指轻骑兵团用的）军旗。
词源
mid 16th cent.: from French， from Italian guidone, from guida 'a guide'.