Why is the 'Dragon Ball' multiverse only comprised of 12 universes

Dragon Ball Xenoverse 2 - Wikipedia

Universe 12, Dragon Ball Multiverse Wiki

Why is the 'Dragon Ball' multiverse only comprised of 12 universes? - Quora

Broly (Universe 20), Dragon Ball Multiverse Wiki

Mirai” Universes: 12, 14, 15 The original timeline - Chapter 71, Page 1630 - DBMultiverse

Festival of Universes: Test Your Strength in the World of Dragon Ball Xenoverse 2!

Every universe in Dragon Ball, ranked from weakest to strongest

Dragon Ball Gods & Cosmos Guide

Dragon Ball Universe – Unofficial Tabletop Role-Playing Game

Why is the 'Dragon Ball' multiverse only comprised of 12 universes? - Quora

Universe 12 - Hope and despair - Chapter 92, Page 2155 - DBMultiverse

Universe 12 - New Future - Chapter 91, Page 2115 - DBMultiverse

Why is the 'Dragon Ball' multiverse only comprised of 12 universes? - Quora