The Extended Universe Size Index (EUSI) is a number, which indicates the deepest nestation of other verses within a specific verse.

An example of the EUSI.
It can be used to tell the size of a universe, without needing to say its size, due to most verses having beyond infinite sizes, or ordinals/cardinals that aren't named yet.
Definition
We define a function
, now we extend it tofixed point.
Examples
- Protoverse =
- The Universe =
- Berryverse =
- Omniverse =
- The Box =
- MegaBerryverse = where is arbitrarily
- Absoverse =
- Cloudverse -