Juan's 'ONE' is the Spanish word for the number ONE, which is 'UNO'. This term is used in many Spanish-speaking countries and is also used in the popular card game UNO. The game is played with a specially printed deck of cards, each of which has a color and number or action on it. Players take turns matching a card in their hand with the card on the top of the discard pile, either by number, color, or type. The first player to get rid of all their cards wins the game.