The jewel in the head of serpents. There is a tradition among the poets that this jewel is the basis of the serpent's life. There is a story in महाभारत , अश्वमेधिक पर्व , Chapter 30, Verse 42, stating how बभ्रुवाहन brought अर्जुन to life by सञ्जीवनमणि . (For details see under Babhruvāhana)