guidon (n.)youdaoicibaDictYouDict[guidon 词源字典]
"small flag," originally one borne by a military unit to direct movements, 1540s, from Middle French guidon (16c.), from Italian guidone "battle standard," from guidare "to direct, guide," from Old Provençal guidar "to guide," from Proto-Germanic *witanan "to look after, guard" (see guide (v.)).[guidon etymology, guidon origin, 英语词源]