White : Signifies innocence as that of the beginner who has no previous knowledge of Taekwon-Do.
Yellow : Signifies the earth from which the plant sprouts and takes root as Taekwon-Do foundation is laid.
Green : Signifies the plant's growth as Taekwon-Do skills begin to develop.
Blue : Signifies the heavens, towards which the plant matures into a towering tree as training in Taekwon-Do progresses.
Red : Signifies danger, cautioning the student to exercise control, and warning an opponent to stay away.
Black : The opposite of white, therefore signifying maturity and proficiency in Taekwon-Do. It also indicates the wearers imperviousness to darkness and fear.