Question: why are they called bts?
Answer: Name. The group's name, BTS, stands for the Korean expression Bangtan Sonyeondan (Korean: 방탄소년단; Hanja: 防彈少年團), literally meaning "Bulletproof Boy Scouts". According to member J-Hope, the name signifies the group's desire "to block out stereotypes, criticisms, and expectations that aim on adolescents like bullets".