Board Thread:Questions and Answers/@comment-17701320-20130904204409/@comment-3361105-20130904204934

It's complicated.

You're right. Before Flashpoint, the mainstream DC Universe was called "New Earth" or "Earth-0".

After Flashpoint, it has not actually been named officially, but we are calling the mainstream DCU "Prime Earth"

Most of the characters and their backstories are essentially the same as they were before, but some are very different.