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

Multiverse, Dragon Ball Wiki

DBMultiverse Colors Page 12 - DBMultiverse

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

Universe 16: Son Bra's little problem - Chapter 54, Page 1240 - DBMultiverse

Dragon Ball Z: Infinite World - Wikipedia

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

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

Is it possible that Dragon Ball Multiverse may have inspired Dragon Ball Super in some way? - Quora

The Vast Macroverse Explained, Wiki

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

Universe 12 - Hope and despair - Chapter 92, Page 2151 - DBMultiverse

Mirai” Universes: 12, 14, 15 The original timeline - Chapter 71, Page 1655 - DBMultiverse