Ngag Sungma

Ekajati (Tibetan: Tsechikma or Ralchikma) Single plaited Mother

(Also known as Ngag Sungma, Mother Protectress of Mantra)

Ekajati is the supreme protectress of Ati Great Perfection Teaching, Dzogchen.

She is a guardian of the tantric path and protects it from those who are unworthy.

She removes obstacles to the life and accomplishment of those who do practice on the Secret Mantra path.

She is a guardian of mantras who keeps them from those who are unworthy of using them and ensures those who have been empowered to use them, do so for appropriate purposes.

She is wrathful and can assume a number of different forms and colors and the personal protector of the Dalai Lama.

She is wrathful and can assume a number of different forms and colors.

She can hold various implements and weapons.

She wears a wreath of severed heads, usually has one eye in the middle of her forehead, one fang and one breast.

She is nearly naked and menacing as she stands amidst a mass of wisdom fire.

Ekajti is the highest of protectors.

She guides those whom she protects upon the single path of unity of the innate Buddha nature.

This is symbolized by the single open eye of wisdom upon her forehead, while her two eyes are sunken and dried, symbolizing the exhaustion of dualistic perception;

by the single plait of hair that flows straight upward, symbolizing the single unified path of the Ati Great Perfection; by her single tooth of the realization of the single nature of all.

That pierces the aorta of dualistic demonic forces;

and by her single breast that nutures the pure practioner upon the spiritual attainments of the single essence of ultimate truth.

Source

http://www.iloveulove.com/spirituality/buddhist/buddhistdeities.htm