What is "lakini"

As per Yoga and Tantra, there exist psychic Chakra's in human body. There are believed to be seven major Chakras, which are arranged vertically along the axial channel ( sushumna nadi). They begin from Muladhara to Sahasrara. Each of these Chakras are presided over by six Yogini's or Goddesses. Lakini is the goddess that rules over Manipura Chakra. She is called the benefactress of all.