Jack of Spades meaning in Cartomancy and Tarot CardariumJack for ♠ is a playing card in a set of cards. It is considered a card of mystery, strength, and insight. The Knave in Black can also suggest a person of dark complexion or a person that is talented in their craft. This playing card often carries an air for enigma and may signify the significance of having trust in gut feelings in a situation.