A heart symbolizes that someone loves you. It has been used throughout history as a symbol of the spiritual, emotional, moral, and in the past also intellectual core of a human being. In European traditional art and folklore, the heart symbol is drawn in a stylized shape. This shape is typically red, suggesting both blood and, in many cultures, passion and strong emotion. The hearts have constituted, since the 15th century, one of the red suits in most playing card decks. The shape is used to show romantic love; especially on St. Valentine’s Day cards, candy boxes, and similar popular culture artifacts as a symbol of romantic love.