guidon
Concise Oxford English Dictionary © 2008 Oxford University Press:
guidon /ˈgʌɪd(ə)n/
▶noun a pennant that narrows to a point or fork, especially one used as the standard of a light cavalry regiment.
– origin C16: from Fr., from Ital. guidone, from guida ‘a guide’.
'guidon' also found in these Oxford entries:

