BTS
n. plural-onlyn. Stands for Bangtan Sonyeondan. A very famous South Korean boy band that is known all over the world. People also use these letters to mean 'behind the scenes' when showing how a movie or show was made.
n. Abbreviation for Bangtan Sonyeondan. A globally prominent South Korean boy band; also used as an initialism for 'behind the scenes' to refer to candid or unedited footage from a production.
I love listening to BTS on my way to school.
The documentary includes exclusive BTS footage showing how the actors prepared for their most difficult stunts.
When referring to the band, it is treated as a proper noun and usually takes a singular or plural verb depending on regional dialect; as an initialism for 'behind the scenes', it often functions as an adjective before a noun.