The term 'Retro Skyscraper Style' refers to the Art Deco style of architecture, which was popular in the 1920s and 1930s. This style is characterized by its geometric shapes, bold colors, and ornamental decorations. It is often seen in skyscrapers, which were built during this period. The term 'Deco' is a shortened version of the word 'Art Deco, ' which is used to describe this style of architecture.