A hat with two points or horns, especially the distinctive diagonal hat worn by Napoleon and 18th-century military officers.
From French 'bicorne,' derived from Latin 'bicornis' (two-horned). The specific style became fashionable in 18th-century European courts and military dress, with Napoleon making it iconic.
Napoleon's sideways bicorne became one of history's most recognizable silhouettes—he actually wore it with the points front-and-back rather than side-to-side, which made him instantly identifiable to his troops on the battlefield.
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