Supergalaxy

A supergalaxy (also known as a Metacluster) is a hypothetical object that contains multiple hyperclusters. None have been observed in our universe, but they may exist due to the universe being larger, or the Universe itself could simply be one. If they exist, it's likely that only one or two exist in our observable portion of the universe, so it would be very hard to find them. If the multiverse theory is true, than supergalaxies would likely exist in other universes that are bigger than ours, and they could even cluster into Supergalaxy clusters.

Properties
Supergalaxies could be tens of billions of light years across. They would likely contain at least 10-20 hyperclusters, several thousand superclusters, and many quintillion planetary objects.