Type III

A Type III multiverse would be a consequence of the many-worlds interpretation of quantum mechanics, in which quantum events with probabilistic outcomes resolve in all ways at once, passing into a vast number of Everett branches each considered to be its own universe. Such a multiverse would function identically to a Type I, only in alternate quantum branches rather than alternate locations in 3-space; one could model a divergence as either a single branch that splits into two, or as a pair of Hubble volumes in the Type I multiverse which begin to differ only upon the resolution of one particular quantum function, If a Type III multiverse is working with infinite Higher Dimensions, where each Higher Dimensions Transcend infinitely uncountable one another, one should not compare any Higher Dimensions, as each of them is infinitely countless above one another, so it will never end, as it will infinitely countlessly piling upwards for all eternity, forming the infinite Higher Dimensions that exist in the Type III multiverse.

Type IV

A Type IV multiverse abstracts even further from the above, positing that alternate spaces with different general principles of physics and mathematics exist independently of ours. Tegmark asks "why these equations and not others?" and resolves the question with the assumption that any other set of equations also exists as a distinct mathematical – and thus physical – structure. This may be analogous to a megaverse or gigaverse, in which one needs even fewer starting assumptions than a set of laws of physics. It contains all mathematics.

Multiverse and Omniverse

It is common, especially in fiction, to see the terms "multiverse" and "omniverse" used interchangably to describe a set of universes, often specifically written as the set of all possible universes or all fictional universes. On this wiki, the omniverse is taken to be some number of levels above the multiverse, perhaps infinitely many, but neither one is seen as an insurpassable boundary. Because fiction can be written involving structures beyond a multiverse or omniverse, interpreting either as a container of all fiction, human thought, or otherwise is incorrect by this view.

An Interdimensional Void is the area in between every single verse, dimension, realm, etc. in a multiverse.

Extra universal space is the term for the empty void of pure vacuum (or, in some interpretations, nothing at all) filling multiverses in between the universes inside. It is essentially a smaller-scale version of The Outside or perhaps even the "place" known as Beyond. Some methods of travelling between universes involve going through this space. It has an arbitrary number of dimensions in both space and time.

This "space" does not always have to exist. Multiverses can be constructed so that all of their universes are in the same spatial location but overlapped on top of each other, and there are undoubtedly many other ways to arrange a huge or infinite number of universes without needing a space beyond it.

A Megaverse is a collection of multiple different Multiverses, either a finite or infinite amount of them, usually each having different properties and interuniversal laws, such as different cosmic events being possible, such as Big Booms, etc.

A megaverse can be contained by a Gigaverse or a Teraverse, or other -verses in the metric hierarchy, but this eventually leads back up to the Archverse chain.

To inhabitants of a multiverse, other multiverses in the same megaverse can be referred to as parallel multiverses, alternate multiverses, or simply other multiverses, depending on the degree of similarity between multiverses in the megaverse. The former two are multiversal analogues of altverses. Some civilisations call the Megaverse an Omniverse, since they haven't discovered the Gigaverse yet.

The most common form of Megaverses (which are beyond the concept dimensionality and beyond mathematics) are stacked on top of each other in a metaphysical space, with multiple being stacked on top of each other in one Gigaverse.

The Gigaverse is the fourth nested level of the metric -verse series and the lowest-level archverse. This archverse contains infinite amount of megaverses, which are the third nested level. The higher megaverse in the hierarchy surpasses the lower one just as the lower one surpasses the Nullverse. Gigaverse is unattainable by any extension of megaverse hierarchies.

The Teraverse is the fifth nested level of the metric -verse series and the second lowest-level archverse. This -verse contains infinite amount of gigaverses, which are the fourth nested level. The higher gigaverse in the hierarchy surpasses the lower one just as the lower one surpasses the Nullverse. Teraverse is unattainable by any extension of gigaverse hierarchies.

The Petaverse is the sixth nested level of the metric -verse series and the third lowest-level archverse. This -verse contains infinite amount of teraverses, which are the fifth nested level. The higher teraverse in the hierarchy surpasses the lower one just as the lower one surpasses the Nullverse. Petaverse is unattainable by any extension of Teraverse hierarchies.

The Petavere density depends on the region. The center of the Petaverse is the densest, which is noticeable by its bright blue color. The outer regions are the least dense. The beyond dimensional outer gaps are incalculable here.

The Exaverse is the seventh nested level of the metric -verse series and the fourth lowest-level archverse. This -verse contains infinite amount of petaverses, which are the sixth nested level. The higher petaverse in the hierarchy surpasses the lower one just as the lower one surpasses the Nullverse. Exaverse is unattainable by any extension of Petaverse hierarchies.

Unlike Petaverses the high density regions are on the outside of the center. The center of an Exaverse is one of the lowest density regions of any Archverse.

The Zettaverse is the eighth nested level of the metric -verse series and the fifth lowest-level archverse. This -verse contains a finite or infinite amount of exaverses, which are the seventh nested level. The higher exaverse in the hierarchy surpasses the lower one just as the lower one surpasses the Nullverse. Zettaverse is unattainable by any extension of Exaverse hierarchies.

The Zettaverse is something many people would even consider EMR (Extended Modal Realism.) Due to its complexity. Its complexity is noticeable by the density of a Zettaverse; most zettaverses have a corner-shaped center( which has high density). There are small areas around the center with large density, however it's hard to calculate/predict where. The regions between the areas of density are the least dense regions of any Archverse.

The Yottaverse is the ninth nested level of the metric -verse series and the sixth lowest-level archverse. This -verse contains infinite amount of zettaverses, which are the eighth nested level. The higher zettaverse in the hierarchy surpasses the lower one just as the lower one surpasses the Nullverse. Yottaverse is unattainable by any extension of Zettaverse hierarchies.