Khecarīcakra

Khecarīcakra (खेचरीचक्र):—One of the five internal mystic centres (pañcacakra), according to the kubjikāmata-tantra (or, kādiprakaraṇa).

These five cakras follow the general principle of a cakra (inward representation of a maṇḍala, the representation of cosmic creation).

The Khecarīcakra is the fifth and final cakra, and is occupied by the goddesses who are called Khecarīs (‘going through the sky’). The cakra is associated with the element Ether and is located on or just above the head.

The Khecarīcakra consists of four maṇḍalas (the khecarī goddesses are seated in the first three):

    the sūryamaṇḍala (which contains twenty-four khecarīs),
    the somamaṇḍala (which contains thirty-two khecarīs),
    the vahnimaṇḍala (which contains eight khecarīs)
    and the ādimaṇḍala (which contains the ādiyoni, the primeval source of creation).

The fourth maṇḍala (ādi) is occupied by Śiva (manifested as Asitāṅga), who is identified with the Navātman.

He is accompanied by Devī or Kubjikā, manifested in different forms.

Above the Khecarīcakra is the Goddess of Supreme Form, to be realized only through the Navātman by intense and persistent meditation.

Source

http://www.wisdomlib.org/definition/khecar%C4%ABcakra/index.html