用户:O-ring/沙盒/National colours

National colours are frequently part of a country's set of national symbols. Many states and nations have formally adopted a set of colours as their official "national colours" while others have de facto national colours that have become well known through popular use. National colours often appear on a variety of different media, from the nation's flag to the colours used in sports. Before World War I, they also served as the colors of different military uniforms for each nation.