Longde (Dzogchen)
Longde (Wylie: kLong-sde; Sanskrit: Abhyantaravarga) is the name of one of three scriptural divisions within Atiyoga, also known as Dzogchen (Wylie: rDzogs-chen) or the Great Perfection which is itself the pinnacle of the ninefold division of practice according to the Nyingma school of Tibetan Buddhism.
The name Longde is translated as 'Space Division' or 'Space Series' of Dzogchen and emphasises the emptiness (strong-pa) or spaciousness (klong) aspect of the Natural State.
Penor Rinpoche states that due to the different approaches of various Dzogchen lineages, three sub-schools have developed of which longde is one. The other two divisions or schools are Semde (Mind Series) and Menngagde (Oral Instruction Series). Penor Rinpoche refers to Longde as the Centredness School and is attributed to Longde Dorje Zampa, Shrisimha and Vairotsana's lineage.
Read more about Longde (Dzogchen): Background, Distinguishing Features of The Space Division, Texts of The Space Division