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"Color wheel graphs" are commonly used. At each point in the complex plane, the graph is a color, where the brightness represents the magnitude, and the hue represents the complex angle. Thus, positive values are cyan, negative values are red, and pure imaginary values are green or magenta. Other complex numbers are mixtures of these. Zero is black, and infinity is white. (Other schemes are also in use)
red
In the Union Jack, the flag of the United Kingdom, there are no parallel lines. The flag consists of diagonal and perpendicular lines intersecting to form a complex pattern of crosses representing the individual countries of the UK. The red diagonal cross of St. Patrick is superimposed over the diagonal white cross of St. Andrew, which is then superimposed over the vertical and horizontal red cross of St. George.
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Not stop sign in the inside circle , not red in the small circle