What is the meaning of Bicorne?

Alternative form of bicorn (two-cornered hat).

bicorn (having two horns)

bicorn (hat, famously worn by Napoleon Bonaparte)

in French fairy tales, a two-horned monster that eats adulterous husbands

two-horned

nominative/accusative/vocative neuter singular of bicornis

two-horned

Source: wiktionary.org