Because every multiverse needs to be pupulated by universes, and those need to be kept organized.
“A multiplanar Branch known as Dominia, the only Loopers are Planeswalkers and most guest Loopers...Magic: The Gathering
“The Marvel Universe is a Looping Universe, focusing on the exploits of its heroes, vigilantes...Marvel Universe
“The DC Comics Loops are Loops focusing on the exploits of DC Comics' various heroes and...DC (Universe)
“The Mass Effect Loops are Loops focusing on the setting of the Mass Effect franchise. The Mass...Mass Effect (universe)
This category has the following 22 subcategories, out of 22 total.