Why is a three phase denoted by R, Y, B

Explain why a three is R, Y, B in a three phase

To distinguish their identity, (By color coding) because they are 120 degrees apart from each other. Change of phase can change three-phase motors rotation as well as the sequence of control in control circuits. They’re identified by their color. Those are rainbow colors, anywhere they are used, they follow their regular sequence. Try to compare them with the color code used in showing resistor values. The three-color represents each phase and these colors are selected to identify the phase and also to determine which phase is connected to which part