The earliest mention of the Vajra is in the Rigveda, a part of four Vedas. It is described as the weapon of Indra, the god of heaven and the chief deity of the Rigvedic pantheon.
An instrument symbolizing vajra is also extensively used in the rituals of the tantra. It consists of a spherical central section, with two symmetrical sets of five prongs, which arc out from lotus blooms on either side of the sphere and come to a point at two points equidistant from the centre, thus giving it the appearance of a “diamond sceptre”, which is how the term is sometimes translated.
Various figures in Tantric iconography are represented holding or wielding the vajra. Three of the most famous of these are Vajrasattva, Vajrapani, and Padmasambhava. Vajrasattva (lit. vajra-being) holds the vajra, in his right hand, to his heart. The figure of the Wrathful Vajrapani (lit. vajra in the hand) brandishes the vajra, in his right hand, above his head. Padmasambhava holds the vajra above his right knee in his right hand.