Jack (playing card)
（重定向自Jack of Spades）
![Jack cards of all four suits](/Images/godic/202501/21/Jack_playing_cards5130.jpg")
![Knave of Coins from the oldest known European deck (c.1390–1410).](/Images/godic/202501/21/Knave_of_coins_-_Italy_2_deck5130.png")
A Jack, also Knave /ˈneɪv/, is a playing card which, in traditional French and English decks, pictures a man in the traditional or historic aristocratic dress generally associated with Europe of the 16th or 17th century. The usual rank of a Jack, within its suit, plays as if it were an 11 (that is, between the 10 and the Queen). As the lowest face (or "court") card, the Jack often represents a minimum standard — for example, many poker games require a minimum hand of a pair of Jacks ("Jacks or better") in order to continue play.