Sanghayan is likely referring to Saṃhanan (संहनन) in Jainism.

It means the physical structure or bone-formation of the body. In Jain karmic philosophy, Saṃhanan describes how strong or compact the body’s internal build is.

Traditionally, there are 6 types of Saṃhanan:

1. Vajra-Rishabha-Nārācha
2. Rishabha-Nārācha
3. Nārācha
4. Ardha-Nārācha
5. Kīlikā
6. Seyā / Hadi in some usages

The first type is the strongest, and the last is the weakest.

In simple words: Saṃhanan is the body’s internal skeletal strength and compactness, as described in Jain karma theory.

If you want, I can also explain the 6 types in very simple language.