thumb|Niguma
Niguma is considered one of the most important and influential yoginis and Vajrayana teachers of the 10th or 11th century in India. She was a dakini, and one of the two female founders of the Shangpa Kagyu school of Vajrayana Buddhism, along with dakini Sukhasiddhi. Her birth name was Shrijnana (or Palgyi Yéshé in Tibetan). Like many of the mahasiddhas and Tantric practitioners of the time, Niguma was known by several names both during her lifetime and afterwards. She was called Yogini Vimalashri, or Vajradhara Niguma, or Jñana (wisdom) Dakini Adorned with Bone (ornaments), or The Sister referring to her purported relationship to the great Buddhist teacher and adept Naropa. She was also sometimes called Nigupta, which is explained by the historical Buddhist scholar Taranatha as follows: "The name Nigu accords with the Indian language, which is Nigupta, and is said to mean 'truly secret' or 'truly hidden.' In fact, it is the code-language of the dakinis of timeless awareness."
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