All Vajras are eight-pointed with an axial central ninth prong and eight curved outer prongs
Vajra [Tibetan: rdo rje] is a Sanskrit word meaning both thunderbolt and diamond.
Additionally, it is a symbolic ritual object that symbolizes both the properties of a diamond [indestructibility] and a thunderbolt [irresistible force].
Vajra are mostly used in Buddhist ceremonies together with Ghantas [= Bell].