There is a very interesting twelfth-century Tibetan work by Dragpa Gyeltsen (Grags-pa-rgyal-mtshan) that we will summarize here, emphasizing his explanations of the symbolism of the parts of the Vajra. He lists four types of Vajras, but of these he only discusses the Symbolizing Vajra, the physical Vajra that can be held in the hand. He then names four types of Symbolizing Vajras:
[a] The nine-pointed Vajra called the Commitment Vajra.
[b] The five-pointed Vajra called the Full Knowledge Vajra.
[c] The three-pointed Vajra which is the Vajra used for exorcising inimical forces.
[d] The Vajra with open ‘horns’ (prongs) called the Wrathful Vajra.[1]