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A flag/symbol used to represent a military unit such as a squad, platoon, or battalion.
LT COL: "Make sure the guidon is 3 steps in front of the company, beside the company commander."

Guidon Bearer: "HOOAH"
by CadetSFC December 23, 2011
A slang term for native americans
Yo, whaddup guidon?
by aubb April 16, 2009