Black Jack is a card game that is also known as Twenty-One. It is a popular casino game and is played with one or more decks of cards. The objective of the game is to beat the dealer by having a higher score than the dealer without going over 21. The term 'Black Jack' is derived from the fact that the highest possible hand in the game is an Ace and a 10-value card, which is referred to as a 'black jack'. The crossword solution for the term 'Black Jack' is 'Pershing', which is a reference to General John J. Pershing, who was a famous American military leader during World War I.