Nine Vehicles

Nine vehicles (theg pa dgu). The nine gradual vehicles according to the Nyingma school: Shravaka, Pratyekabuddha, Bodhisattva, Kriya, Upa, Yoga, Mahayoga, Anu, and Ati.
The first two are Hinayana; the third is Mahayana; the next three are the Three Outer Tantras; and the last three are called the Three Inner Tantras. (RY)

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Nine Vehicles (theg pa dgu)

• When the Buddhist teachings are classified according to their power, they are described as a vehicle (Skt. yana) or a series of hierarchical vehicles, arranged in the manner of the rungs of a ladder. Among these, the specific enumeration of nine vehicles or nine sequences of the vehicle (Skt. navayāna) accords with the standpoint of the rnying ma school, which systematises the Buddhist teachings according to the hierarchy of the three outer or causal vehicles (those of the pious attendants, hermit buddhas and bodhisattvas), those of the three outer classes of tantra (Kriyatantra, Ubhayatantra and Yogatantra), and those of the three inner classes of tantra (Mahayoga, Anuyoga and Atiyoga). GD (from the Glossary to Tibetan Elemental Divination Paintings)

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Also: nine gradual vehicles (theg pa rim pa dgu).