Verse and Dimensions: Structures

Different interpretations of a multiverse containing multiple universes whether they are different structures often considered a multiverse by people or differing interpretations of a multiverse in different cosmologies can involve different interpretations of what a universe is and how they're structured. These interpretations can vary wildly in size and structure.

A Type I multiverse, interpreted as an infinite, isotropic, and homogenous universe itself, contains multiple observable universe-sized region of spaces identical to that of a given observable universe spaced apart by 10^10^115 meters that are interpreted as parallel universes.

When the (10+1)D universe of M-theory is interpreted as a multiverse, the (3+1)D Dirichlet membranes (D3-branes) that can have observable universes embedded in them can be interpreted as universes.