In Jain cosmology, "14 Rajlok" refers to the structure of the universe, which is divided into fourteen layers or regions, called "Rajlok" or "Rajlokas". These are categorized as:

1. Seven Urdhva Lokas (upper worlds)
2. One Madhya Lok (middle world)
3. Seven Adho Lokas (lower worlds or hells)

Madhyabindu (मध्यबिंदु) refers to the central point or the "middle" of these fourteen regions. Specifically, the Madhya Lok is the middle world, where humans, animals, and plants exist. According to Jainism, this is the only realm where souls can attain liberation (moksha).

Details:

• The 14 Rajlokas are described as:

1. Satya Lok (uppermost) 2. Graiveyak Lokas (9 heavens) 3. Anuttara Lokas (5 heavens) 4. Maha-videha (middle world/Madhya Lok) 5. Ratnaprabha (1st hell) 6. Sharkarabha (2nd hell) 7. Valukabha (3rd hell) 8. Pankabha (4th hell) 9. Dhumrabha (5th hell) 10. Tamaha (6th hell) 11. Mahatamaha (7th hell)

But typically, the regions are grouped as:

• 7 Urdhva Lokas (heavens/upper worlds)
• 1 Madhya Lok (middle world)
• 7 Adho Lokas (hells/lower worlds)

The Madhyabindu is thus the central point in the universe, corresponding to Madhya Lok, which is of utmost importance in Jain cosmology because it is the only region where liberation is possible.

In summary: The "14 Rajlok Madhyabindu" refers to the central point (Madhya Lok) among the 14 regions (Rajlokas) of the Jain universe, representing the middle world where humans live and where moksha (liberation) can be attained.