What is a belt? A piece or fabric or rope that holds our pants up? A strip that makes our waistlines more defined? In Taekwondo a belt is a representation to the world and a reminder to ourselves what we have accomplished and learned.
Our uniforms, which are white, represent our eternal commitment to being open to learning, open to new experiences, and to maintaining a pure spirit and integrity. Our first belt also embodies this idea, but our belts change color as we learn and grow. Our belts are the canvas to which color (experience, learning, growth) are added, soiling the canvas, making it darker and darker, eventually becoming black. Over time, the belt begins to fray and gray, because we come to realization that despite all we have done and all we have learned, we truly know nothing.
https://pmaa.ca/taekwondo/training-information/taekwondo-belt-meanings/