The senior section is typically made up of nine ranks. Each rank is called a dan 단, also referred to as "black belt" or "degree" (as in "third dan" or "third-degree black belt"). Black belts begin at first degree and advance to second, third, and so on. The degree is often indicated on the belt itself with stripes, Roman numerals, or other methods, but sometimes black belts are plain and unadorned regardless of rank.