Anuttara Yoga Tantra ("Highest Yoga Tantra" or "Highest Union Continuity") is the highest of four or six levels (depending on school) of Buddhist tantra, characterized by the symbolic use of sexual and wrathful energy to effect transformation and attain enlightenment. A mandala used in Vajrayana Buddhist practices. ... . It has been suggested that this article or section be merged with Spiritual enlightenment. ...

In the Nyingma school of Tibetan Buddhism, the tantras are classified into six levels: Kriya tantra, Charya tantra, Yoga tantra, Atiyoga tantra, Anuyoga tantra, and Mahayoga tantra, with the latter also known as Anuttarayoga tantra or Highest Yoga Tantra. The Nyingma tradition is the oldest of the four major schools of Tibetan Buddhism (the other three being the Kagyu, Sakya and Gelug). ... Tibetan Buddhism is the body of religious Buddhist doctrine and institutions characteristic of Tibet, the Himalayan region (including northern Nepal, Bhutan, and Sikkim), Mongolia, Buryatia, Tuva and Kalmykia (Russia), and northeastern China (Manchuria: Heilongjiang, Jilin). ... This article refers to the primordial state as considered in Tibetan Buddhism and Bon. ...

In the Gelug, Kagyu and Sakya schools associated with the second transmission of Buddhism to Tibet, the highest three levels of the Nyingma system are reflected by a single category, Highest Yoga Tantra. Thus the four level of tantras in the Gelug and other new schools are, in order of the level of acuity of their practitioners, Kriya tantra, Charya tantra, Yoga tantra and Anuttarayoga tantra or Highest Yoga Tantra. The Geluk (dge lugs) School was founded by Tsongkhapa (1357-1419), Tibets best known religious reformer and arguably its greatest philosopher. ... The Kagyu (Tibetan: བཀའ་བརྒྱུད་; Wylie: Bka-brgyud) school, also known as the Oral Lineage and the Spotless Practice Lineage school, is one of four major schools of Tibetan Buddhism, the other three being Nyingma (Rnying-ma), Sakya (Sa-skya), and Gelug (Dge-lugs). ... Sakya is one of four major schools (Nyingma, Sakya, Kagyu and Gelug) in Tibetan Buddhism (Vajrayana). ... Tibetan Buddhism is the body of religious Buddhist doctrine and institutions characteristic of Tibet, the Himalayan region (including northern Nepal, Bhutan, and Sikkim), Mongolia, Buryatia, Tuva and Kalmykia (Russia), and northeastern China (Manchuria: Heilongjiang, Jilin). ... Tibet (older spelling Thibet; Tibetan: བོད་; Wylie: Bod; Lhasa dialect IPA: [; Simplified and Traditional Chinese: 西藏, Hanyu Pinyin: XÄ«zàng; also referred to as 藏区 (Simplified Chinese), 藏區 (Traditional Chinese), ZàngqÅ« (Hanyu Pinyin), having the two names different connotations; see Name section below) is a plateau region in Central Asia and the...