Fanion
A fanion is a small flag used by the French military; the equivalent of an American guidon or British company colour. The name derives from the Italian word gonfanone, or gonfanon. They were often attached to a small staff which was placed in the muzzle of a rifle. The regulation sizes were 50 cm x 40 cm for a battalion fanion, 40 x 30 for a company fanion, and 34 x 27 for a platoon fanion (the latter can also be a triangular pennant 30 x 40). See also
Colours, standards and guidons

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Types of flags
Military of France