Answer

In Jain philosophy, the usual meaning is not “18 directions”. The relevant idea is that each of the five senses has two aspects:

• Dravyendriya = physical sense organ
• Bhavendriya = psychical or inner sense faculty

So, the five senses together are understood in 10 aspects. ( jainworld.jainworld.com)

Explanation

The five senses are:

• touch
• taste
• smell
• sight
• hearing

Each of these has:

• a physical form for bodily functioning, and
• a psychical form for inner awareness and experience.

This is the Jain way of showing that sensing is not only bodily; it also involves consciousness. ( jainworld.jainworld.com)

If you actually meant the “18” mentioned in Jain texts, then Tattvartha Sutra speaks of 18 kinds of dispositions arising from destruction-cum-subsidence of karma, not “directions.” Those include forms related to knowledge, ignorance, perception, attainment, right faith, right conduct, and restraint/non-restraint. ( jainworld.jainworld.com)

Spiritual Understanding

This teaching is important because Jainism always distinguishes between:

• the body, and
• the soul’s inner awareness.

It helps us understand that true experience is not only physical; it also depends on the condition of the soul and its karmic state. ( jainworld.jainworld.com)

Takeaway

So, in Jainism:

• 5 senses × 2 forms each = 10 aspects
• 18 usually refers to a different doctrinal classification, not directions. ( jainworld.jainworld.com)