The heart as an icon : The use of the heart as an icon for love and devotion has been one of the most enduring through the ages. In the traditional art and folklore of Europe, the heart symbol was drawn in a stylized shape. This shape is typically coloured red, suggesting both blood and, in many cultures, passion and strong emotion. The heart, as one of the red suits in playing cards decks, have existed since the 15th century. The shape is particularly associated with romantic love; it is often seen on St. Valentine's Day cards, chocolate boxes, and similar popular culture artifacts as a symbol