In Jainism, the concept of the universe is both vast and intricate, resembling what can be described as a multiverse, though it is articulated in traditional Jain cosmological terms.

Jain cosmology describes the universe (Loka) as eternal, uncreated, and indestructible. It is not the creation of any deity, nor does it ever end. The universe is divided into three main regions:

1. Urdhva Loka (upper world): Abodes of heavenly beings (devas).
2. Madhya Loka (middle world): Where humans, animals, and plants live.
3. Adho Loka (lower world): Abodes of hellish beings (narakis).

Within each of these realms, there are countless layers, worlds, and sub-worlds, each inhabited by different types of living beings. According to Jain scriptures, there are innumerable universes, each with its own cycles of time and existence. This suggests a vision of reality that is far more expansive than a single universe, similar in some respects to the modern scientific idea of a multiverse.

Key Points in Jain Cosmology:

• The universe has no beginning or end; it is anekant (multi-faceted).
• There is no creator or destroyer; all changes happen according to natural laws.
• Infinite souls (jivas) inhabit infinite realms within this vast universe.
• Time is cyclical, with endless cycles of progress (utsarpini) and decline (avasarpini).
• There are countless other worlds, some similar to ours and some very different.

Scriptural References:

• Jain texts like the Tattvartha Sutra and Tiloya Panatti describe the structure and vastness of the cosmos.
• The Lokavibhaga (5th century CE) details the infinite nature of universes.

Summary: Jainism presents a concept of an infinite, eternal, and multi-layered cosmos, populated by innumerable souls and realms. While Jainism does not use the term "multiverse," its cosmology includes the idea of countless worlds and realms existing simultaneously, which aligns conceptually with the modern notion of a multiverse.