LUNA is the name of the new chain (also known as LUNA 2.0) that emerged after the collapse of UST/Luna in May 2022. After the collapse, a whole new chain was created on which future transactions would be conducted. The old chain was split: Terra is be the name of the new chain (known as LUNA 2.0), and LUNA Classic (LUNC) is the original Terra LUNA blockchain's native token.