Kukkiwon/WTF Taekwondo uses the following series of forms (called the Yudanja series) for Black Belt forms: * Koryo (고려) - first dan, also spelled Goryeo and Koryeo ("learned man", symbolizing a wise person) * An older, deprecated form called Original Koryo is also considered by some clubs/associations to be one of the Yudanja forms, but it isn't considered so by the Kukkiwon (for gradings or the Master Instructor Course) or by the WTF (for the World Poomsae Championships). * Keumgang (금강)) - second dan ("diamond", symbolizing hardness, unbreakable) * Taebaek (태백)) - third dan ("sacred mountain", symbolizing spirituality) * Pyongwon (평원)- fourth dan, also spelled Pyeong-won ("open plain", symbolizing peacefulness) * Sipjin (싶진)) - fifth dan, also spelled Shipjin ("