Earth-Two-A

Earth-2A is the unofficial name of the universe that the Justice Society of America live in. The natives of that earth refer to it as Earth-Two.

Background Information
The name "Earth-2A" comes from the fan made nickname of the Superfriends universe, which is Earth-1A. That nickname was given since it was an earth that was similar to Earth-One, but not quite the same. Some of it's history is exactly the same.