Three lineages in the old translation school of the Nyingma tantras
There are three lineages in the old translation school of the Nyingma tantras:
the 'Distant Oral Lineage', from the direct oral teachings of the Buddha;
the 'Near Treasure Lineage' (terma) from teachings of discovered treasure texts, written and concealed in holy places by Guru Rinpoche, Khandro Yeshe Tsogyal and others, for the benefit of future generations, and
the 'Lineage of Profound Pure Visions', from teachings received by various Saints during visions in meditation and post meditation.