User blog comment:Curtis712120/Earth-3/@comment-28458080-20160623042720

that is in the comics here it is home of The Flash(Jay Garrick) and probably golden age heroes Earth 2 is the one with no heroes except the antihero the Hood(Robert Queen)

now the multiverse is like this

E-1 : Arrowverse

E-2 : Zoom's earth with no heroes

E-3 : Jay Garrick's earth

E-4: Supergirl's earth