BT21

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BT21 comprises 8 special characters created by South Korean boy group BTS. The character designs were based on the original ideas and sketches by the 7 members of the group. The name BT21 is a combination of the group's name BTS and the 21st Century. Member Suga commented that the name should represent both BTS and the 21st Century so they would live for the next 100 years.

-Wikipedia