In DC Comics continuity, there is currently a pretty big multiverse. In it, the main earth is Prime Earth. There are a lot of them, like Earth-23 with a black Superman as the president of the United States and the very spooky Earth-13 with Superdemon as its protector.
This seems like very prime-earth-centric terminology. Do other continuities’ inhabitants view their worlds as Earth-0 and as the main world, as far as we know based on comics?