vajra

noun3

1. •
   A Buddhist ceremonial mace and symbol, usually interpreted as both a diamond and a thunderbolt.

   • At the centre is a five-pronged vajra draped and bound with a coloured silk scarf, representing one of the Five Buddha wisdoms or activities. — 2004
2. •
   The weapon of Indra, the god of heaven and the chief deity of the Rigvedic pantheon, used to kill sinners and ignorant persons.
3. •
   One of the five central Buddhist principles, representing indestructible substance that cuts and penetrates through emotional instability or uncertainty.

   • Those five principles or buddha families are called vajra, ratna, padma, karma, and buddha. — 1981