In a longitudinal wave, the motion of the medium is parallel to the direction of the wave. This means that the particles move left and right which in turn makes the other particles start to oscillate.
The UNIA founded by Marcus Garvey has a constitution which defines red, black, and green as the Pan-African colours: red representing the noble blood that unites all people of African ancestry, the colour black for the people, green for the rich land of Africa..
Meanings Of The Belt Colors by. Grand Master James S. Benko. The color of the belts used is by no means merely some random selection of colors to distinguish the different ranks. Each belt color has a meaning symbolizing advancement and increased awareness. The color belt system is not just a representation of rank advancement, it is also is an acknowledgement of individual personal growth. Such advancement signifies not only growth within the dojang (training hall), but that of positive character and growth outside of the dojang.