Not to be confused with Diaverse, in which the two interacting components don't have to be universes, just verses.
A Biverse is a common object in a Multiverse, the 3 main types are as follows. The Orbital Biverse, in which 2 universes orbit each other via some multiversal force. The Peanut Biverse is where 2 universes are touching, these are the most common. Some believe that one of the supervoids in our universe is another universe, in this case, we are in a Peanut Biverse at the very least. The Fusion Biverse forms when a universe starts inside another universe. Inside the middle universe, it's forces and the forces of the universe it's inside of affect everything in the middle universe.
Orbital Biverses (OB)
These are the most stable, as Peanuts will fuse into a universe, and Fusions can break the inner universe's wall. These can form in many ways, we will look at 3.
Gravity Biverses (GOB)
Bound by gravity, these universes will always turn into a Peanut Biverse, as the universes will lose energy from gravitational waves. A Binary Gravity Biverse (BGOB) are classed by universes with the same mass orbiting each other around an epicenter which is outside both universes. A Planet System Gravity Biverse (PGOB) are classed by a lighter universe orbiting a heavier one, and the epicenter is inside the bigger one.
Charge Biverses (COB)
Bound by the electromagnetic force, these universes wont die on there own, only if an outside force or charge change occurs. There are 3 types which are about the same in style, they are Matter-Matter (MMCOB), Anti-Matter-Anti-Matter (AACOB), and Matter-Anti-Matter (MACOB).
Machine-Made Biverses (MOB)
Very common type of Biverse. A machine places heavy magnets and thrusters on 2 universes, the mass and charge of the magnets pull the universes to 1 another, thrusters are turned on so that they don't collide, when a stable speed is reached, thrusters turn off.
Peanut Biverses (PB)
Despite being another megaclass of Biverse, they are just OBs that are touching, for the letter classification, swap the OB with PB. (MACPB)
Fusion Biverses (FB)
These are the most unstable, there is only 1 type (FB), but there are many ways in which these break. We will look at 2 ways these can break, but there are more.
Wall Breaking (WB)
These mostly happen when both universes have the same speed, the 2 types are stabbed wall breaking (SWB) and cut wall breaking (CWB). SWB happens when an object breaks the wall via ramming/stabbing it, the spacetime of both universes are now connected, making them 1 universe. CWB is a lot rare, a part of the wall goes into a wormhole, this is fine, but when the wormhole closes, the wall is cut.
This happens when the universes aren't moving at the same speed, when the walls meet, they fuse, leaving a hole on the outside for the smaller universe's insides to escape. This is a lot like how a Carbon-based lifeform's cells eject large molecules.
In a #verse, there is only 1 type of connection. (Orbiting, Peanut, or Fusion) The lowest class is a biverse.
In a #verse Complex, there are 2 types of connections. The lowest class is a Triverse Complex, a Biverse Complex can't form as Universe A can only connect to Universe B in 1 way.
In a #verse Complexion, all 3 connections are there. You may think the lowest class is a Quadrverse Complexion, but no, there are Triverse Complexions. Universe A is orbiting Universe B, (1 connection) Universe C contains Universe A, (2 connections) and Universe C is only touching Universe B (3 connections)