Everyone knows symbol means something used for or regarded as representing something.
It can be a letter, figure, or other character or mark or a combination of letters or the like used to designate something.
In the traffic light, there are 3 colors: red, yellow and green(blue).
red is STOP, yellow is READY, green is GO.
Now which I'm showing is not about the graphic or image it changed, we should focus on the 'representing'.
lets think, if we change the colors of the light, can we still call it 'traffic light' ?
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