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The NCS color system ("Natural Color System") is a color system designed by the white, black, yellow, red, blue, and green. Colors are defined by three values, specifying the amount of blackness, chromaticity, and a percentage value between two of the colours yellow, red, blue or green. NCS color notations can also be tagged with a letter giving the version of the NCS color standard that was used to specify the color.
Examples of NCS color notation -- the colors of the Swedish flag: