Nine gradual vehicles

Nine gradual vehicles (theg pa rim pa dgu). Shravaka, Pratyekabuddha, Bodhisattva, Kriya, Upa, Yoga, Maha Yoga, Anu Yoga, and Ati Yoga. 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]