The term ART (Building Style) is summarized by the crossword solution DECO (4 letters). Deco is short for ART Deco, a style of visual arts, architecture and design that first appeared in France just before World War I. It is characterized by bold geometric shapes, bright colors, and lavish ornamentation. ART Deco was popularized in the 1920s and 1930s, and its influence can still be seen in many modern buildings today.