In karate there are two types of grades they are called kyu grades and dan grades. Kyu means student and refers to a student who is not yet a black belt, ie a colored belt. The kyu number refers to how many grades away from black belt you are. For example 6th kyu means you are 6 grades away from black belt. Most styles have 10 kyu grades but some may have more or less.
Sulfur is the second element in the sixteenth column of the periodic table. It is classified as a nonmetal. Sulfur atoms have 16 electrons and 16 protons with 6 valence electrons in the outer shell. Sulfur is the tenth most abundant element in the universe. Sulfur can take the form of over 30 different allotropes (crystal structures). This is the most allotropes of any element.
Sulfur (S) Sulfur (S), also spelled sulphur, nonmetallic chemical element belonging to the oxygen group (Group 16 [VIa] of the periodic table), one of the most reactive of the elements. Pure sulfur is a tasteless, odourless, brittle solid that is pale yellow in colour, a poor conductor of electricity, and insoluble in water.