In Taekwondo, which term refers to the ranks below black belt?

In Taekwondo, the term that refers to the ranks below black belt is "Gup." This term is used to classify the various colored belt ranks that practitioners earn as they progress in their training before achieving the black belt rank. Gup ranks are an essential part of the Taekwondo ranking system, as they indicate a student's level of skill, knowledge, and experience in the art. Each Gup rank typically has its own colored belt to signify the level, making it a visual representation of a student's progress.

While "Dan" is a term for black belt ranks, "Juniors" and "Masters" do not specifically classify ranks; rather, they may refer to age groups or experience levels within a class or school context. Thus, Gup is the correct term associated with ranks below black belt in Taekwondo.