Thread:ADour/@comment-5270921-20140511223013/@comment-4651179-20140511234356

Earth-120703 is numbered as such because it first appeared in 2012, the 07th month, on its 03th day.

Earth-161 is the inversion of Earth-616.

A lot of realities which debuted in 2010 to 2014 begin with the last two digits of the year, followed by the month it debuted, and then the issue it first appeared (sometimes issue first and then month).