Tib., mKha'-'Gro sNying-Thig; mkha' 'gro'i snying thig
Heart Essence of the Dakinis, Dakini's Heart Essence
Name for the transmission lineage of Dzogchen teachings that goes back to Padmasambhava who passed this (his) version of the Nyingtig teachings to princess Pema Sal and to his special student and consort Yeshe Tsogyal.
Also known as Heart-Drop of the
Dakinis, the Khandro Nyingtig constitutes a terma
revealed by Pema Ledrel Tsal
which was later included in the famous Nyingtig Yabshi
by Longchenpa.
These Nyingtig teachings based on Padmasambhava are sometimes called Padma Nyingtig (Tib., pad ma snying thig, pad ma'i snying thig).
At times, one also encounters the expression Mother and Son Khandro Nyingtig (Tib., mkha' 'gro snying thig ma bu), which refers to the combination of the Khandro Nyingtig text (the mother) and the commentary (the son) known as Khandro Yangtig, the latter of which is by Longchenpa and part of the Nyingtig Yabshi.