Board Thread:Policies/@comment-43505-20190709140226/@comment-1038387-20190807200950

Post-Rebirth? That at least continues the naming standard. Although technically it's..
 * Pre-Zero Hour: Earth-One/New Earth
 * Post-Zero Hour: Earth-247
 * Threeboot: Earth-Prime
 * New 52: not a clue. Some speculate Earth 2. They're listed as Pre-ZH because of the "no new pages rule from 2011 and we never did discover what they were so we never moved them to anything else.
 * Rebirth: presumably, Prime Earth.

We never moved them because it's all an Alternate Future anyway.