What is BT21? I'm pretty new to the BTS ARMY and I see BT21 being talked about a lot when BTS is brought up. Is it a BTS thing? What is the
![BTS ARMY Türkiye D-(432) - 'D-DAY' on Twitter: "Beraberiz #TATA #VAN #BT21 #UNVERSTAR #BTSTarafındanTasarlandı https://t.co/3lUGfIqRJd" / Twitter BTS ARMY Türkiye D-(432) - 'D-DAY' on Twitter: "Beraberiz #TATA #VAN #BT21 #UNVERSTAR #BTSTarafındanTasarlandı https://t.co/3lUGfIqRJd" / Twitter](https://pbs.twimg.com/media/DOPpI1_U8AAj4Nm.jpg)
BTS ARMY Türkiye D-(432) - 'D-DAY' on Twitter: "Beraberiz #TATA #VAN #BT21 #UNVERSTAR #BTSTarafındanTasarlandı https://t.co/3lUGfIqRJd" / Twitter
![2018 Yeni Kpop OPPASTORE BTS BT21 Standcard Bangtan Boys Karikatür Plastik Dekorasyon için ORDU - AliExpress 2018 Yeni Kpop OPPASTORE BTS BT21 Standcard Bangtan Boys Karikatür Plastik Dekorasyon için ORDU - AliExpress](https://ae01.alicdn.com/kf/HTB1c050aizxK1RjSspjq6AS.pXaL/2018-Yeni-Kpop-OPPASTORE-BTS-BT21-Standcard-Bangtan-Boys-Karikat-r-Plastik-Dekorasyon-i-in-ORDU.jpg_.webp)