Note: Do not rely on this information. It is very old.
NapoleonNapoleon, a round game at cards. Five cards are dealt to each of the players, who declare in turn, beginning at the dealer's left, how many tricks they will attempt unless they elect to pass. A declaration of Nap - i.e. the whole of the five tricks - overrides all others. The player who declares for the largest number of tricks has to play, and the others must follow suit if possible. If he succeeds, he receives a certain amount for every trick from each of the other players, and, if he fails, pays a corresponding amount to them.