What is the meaning of Belter?

A maker or worker of belts.

Anything that is particularly good of its class.

A very good-looking person.

One who sings forcefully.

One who uses the specific vocal technique of belting.

A song suitable for forceful singing.

A person who mines asteroids for minerals or lives in the vicinity of an asteroid belt.

Alternative spelling of belta (“fantastic; excellent”).

indefinite plural of belte

Source: wiktionary.org