Green Tara is a tantric meditation deity whose practice is used by practitioners of the Tibetan branch of Vajrayana Buddhism to develop certain inner qualities and understand outer, inner and secret teachings about compassion and emptiness.
Vajradhara The founder of Vajrayana Buddhism, or Tantra, and the source of all the Tantric teachings. He is the same mental continuum as Buddha Shakyamuni but displays a different aspect. Buddha Shakyamuni appears in the aspect of an Emanation Body, and Buddha Vajradhara appears in the aspect of an Enjoyment Body. He also said that in degenerate times he would appear in an ordinary form as a Spiritual Guide.
The ritual scepter (vajra, rdo-rje) and bell (ghanta, dril-bu) are the most important ritual elements in Vajrayana Buddhism. The vajra, from which Vajrayana Buddhism takes its name, symbolizes the active male aspect of enlightenment often equated with skillful means, compassion, or bliss. The vajra evolved from the thunderbolt-scepter wielded by the Vedic god Indra