A Ka Tha Terms

A Ka Tha has mystical significance (see below). It also underlies
A Ka Tha
a ka sha =akasha =space, ether
a kA za = akAza = space, ether
a ka tha = 1 1 17 = 19
cf. Hebrew Gematria 19 --- to breathe, to live; to speak; to wind, coil, encircle; life --- name of Eve; a round tent or encampment, a hamlet or village http://www.billheidrick.com/works/hgm1/hg0010.htm
A Ka Tha is the Downward Triangle or Inverted Triangle In simple accounts this triangle becomes the starting point for ka to combine as ka-pa, ka-ma, and ka-la. The Mahanirvana tantra gives a much more subtle account: The Vindu, with the Nirvana-kala, Nibodhika, and Ama-kala, are situated in the lightning-like inverted triangle known as A, Ka, Tha, and which is so called because at its apex is A; at its right base is Za; and at its left base Tha. It is made up of forty-eight letters (matrika): the sixteen vowels running from A to Ka; sixteen consonants of the ka-varga and other groups running from A to Ka; and the remaining sixteen from Ka to Tha. Inside are the remaining letters (matrika), ha, la (second), and ksha. As the substance of Devi is matrika (matrika-mayi) the triangle represents the Word of all that exists. The triangle is itself encircled by the Chandramandala. The Vindu is symbolically described as being like a grain of gram (chanaka), which under its encircling sheath contains a divided seed. This Parang-vindu is Prakriti-Purusha, Shiva-Shakti. It is known as the Shabda-Brahman (the Sound Brahman), or Aparabrahman. A polarization of the two Shiva and Shakti Tattvas then takes place in Parashaktimaya. The Devi becomes Unmukhi. Her face turns towards Shiva. There is an unfolding which bursts the encircling shell of Maya, and creation then takes place by division of Shiva and Shakti or of Hang and Sah. The Sarada says: The Devataparashaktimaya is again Itself divided, such divisions being known as Vindu, Vaja, and Nada. Vindu is of the nature of Nada or Shiva, and Vaja of Shakti, and Nada has been said to be the relation of these two by those who are versed in all the Agamas. The Sarada says that before the bursting of the shell enclosing the brahma-pada, which, together with its defining circumference, constitute the Shabda-brahman, an indistinct sound arose (avyaktatmaravobhavat). This avyaktanada is both the first and the last state of Nada, according as it is viewed from the standpoint of evolution or involution. For Nada, as Raghava-bhatta says, exists in three states. In Nada are the guna (sattva, rajas, and tamas), which form the substance of Prakriti, which with Shiva It is. When tamo-guna predominates Nada is merely an indistinct or unmanifested (dhvanyat ? mako?vykta-nadah) sound in the nature of dhvani. In this state, in which it is a phase of Avyaktanada, it is called Nibodhika, or Bodhini. It is Nada when rajoguna is in the ascendant, when there is a sound in which there is something like a connected or combined disposition of the letters. When the sattva-guna preponderates Nada assumes the form of Vindu. The action of rajas on tamas is to veil. Its own independent action effects an arrangement which is only perfected by the emergence of the essentially manifesting sattvika guna set into play by it. Nada, Vindu, and Nibodhika, and the Shakti, of which they are the specific manifestation, are said to be in the form of Sun, Moon, and Fire respectively.