What is a 15 year old student of Tae Kwon Do with a 2nd poom called?

According to the Kukkiwon (World Taekwondo Headquarters in Seoul, Korea), 1st, 2nd, and 3rd pum holders, being 15 years of age or above, is the same grade of Dan holder, However, a 15 year old student with a 2nd pum (poom) is called a 2nd pum. They must transfer their rank to 2nd dan in order to be called that.

Depending on the association, children under a certain age are not allowed to be recognized with the adult rank of "dan" (Degree of the Black Belt). According to the requirements of the Kukkiwon, a student under the age of 15 may test for 1st through 3rd pum (Junior Black Belt). Once the student reaches the age of 15, they may pay to have their rank transferred to an adult "dan" rank, or continue to test for pum levels until the age of 18.

Ordinarily, a student must be 16 before testing for a 2nd Dan, however a 2nd pum may transfer to 2nd Dan at the age of 15. However, if they have not yet transferred their rank, then they are still called a 2nd pum, regardless of their age. The required age for 3rd Dan is 18, however a 15 year old 3rd pum may transfer their rank to 3rd Dan. The student must be 18 before they can test for 4th pum, if three years have passed since they became 3rd pum. At that time, they may transfer their 4th pum to 4th Dan at the age of 18.