ekam is nirguna brahman as ekam the ultimate oneness the state where the creator the created objects all the forces exist as one because the word ekam is used in 'thiruvasakam ' in the sense that 'the whole thing exist' it dosn't call it as god but simply as oneness i think that perhaps the god is not viewed as an external one the word ekam in tamil represents 'one' and 'one that is peerless' in 'thiru nadana ula' sivan says about it as the assemblage which generates of it's own