The heruka (Tib. ཧེ་རུ་ཀ་, Wyl. he ru ka) is a masculine deity, wrathful or semi-wrathful, who represents the dynamic union of compassion and skilful means. In the Nyingma tradition the term is often used to refer specifically to Chemchok Heruka or Yangdak.
According to a tantra:
- He stands for great compassion.
- Ru means the absence of gathering.
- Ka means not abiding in anything whatsoever.
- Padmasambhava & Jamgön Kongtrul, Light of Wisdom, Vol. 1 (Hong Kong: Rangjung Yeshe, 1999), p.64-65 & 170.