Teachings of the Nyingma School
The Nyingma teachings are divided into the Long Transmission (Tib. ring gyü) of Kama and the Short Transmission (Tib. nyé gyü) of Terma; other teachings were received by masters directly in Pure Visions (Tib. dak nang) from deities or gurus, in experiences or in dreams.
Particular to the Nyingma school is the division of the teachings into nine ‘yanas’ or vehicles.