Answer

In Jain cosmology, one Rajju is an extremely vast unit of distance. It is not usually expressed as a fixed number of miles or kilometers in ordinary terms.

Traditionally, a Rajju is described as the distance a deity can travel in six months while moving continuously at an extraordinarily high divine speed.

Explanation

Jain scriptures use Rajju to measure the enormous dimensions of the universe, especially the height and breadth of Lokākāśa — the inhabited universe.

For example:

• The height of the Jain universe is described as 14 Rajju.
• Rajju is used because ordinary human measurements are too small to describe cosmic distances.

Takeaway

A Rajju is a Jain cosmological unit representing an immeasurably vast distance, used to explain the size of the universe in Jain Dharma.