For the Special Anti-Terrorist Unit, also called EKAM, see Special Anti-Terrorist Unit (Greece)
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Ekam (Tamil: ஏகம் - "the supreme oneness") is the term used in Akilathirattu Ammanai, the holy book of Ayyavazhi, to represent The Ultimate Oneness. In Thiruvasakam-2 it was stated that it was from this Ekam that all objects, including the separate Godheads, Devas and asuras, of the universe formed. As per Akilam, this state of ekam is beyond the consciousness and derived to beyond the state of changing and is the extreme state in which the whole universe exists.
The Ekam is said to be the supreme as well as the ultimate self from which the whole cosmos formed. This formless attribute is said to be defined from the human point of view. But this formless Ekam, without losing its constant and formless nature, is present inside all things in the universe. That is, it remains as infinite within every finite, formless within every definite form. It is the supreme absolute self in which all the substances of cosmos shares their existence.
The derivations of Ekam in Ayyavazhi scriptures are sometime close to the pantheistic form of theology. In the mythology of Ayyavazhi God-heads such as Siva, Vishnu are said to be the godheads who have power to rule this Ekam, varying from time to time, Siva until Kaliyuga and Vishnu from the starting of Kaliyuga. There are separate quotes in Akilam for focusing Siva as well as Vishnu as capable for position. But, still the Ekam is addressed beyond these god-heads.
But when Vaikundar, is jailed in Singarathoppe, he says "I am the one who created the Ekam and the one who is omnipresent everywhere". By this, the theology reveals Vaikundar (God) as beyond the attributes of Ekam, which moves the theology of Ayyavazhi more towards pantheism.
Other understandings 
Ekam is Sanskrit for "one, single, solitary" (neuter gender), as a noun meaning "unity". In spirituality, it refers to a concept of monism akin to that of Brahman in Advaita philosophy and Smarta theology.
See also 
- Akilattirattu Ammanai published by T. Palaramachandran Nadar, 9th impression, 1989 Page 225-227
- Akilathirattu Ammanai Parayana Urai, A. Arisundara Mani, 2002.
- Sri Vaikunda Swamigal and the Struggle for Social Equality in South India, Dr. R. Ponnu, 2000.