Recently, I saw a DVD talk by Lorne Hoff called Zero. Part of the talk was a kind of countdown of the stages:
3 – dimensions of space, the field of multiplicity in typical waking state. (and dreams)
2 – absolute and relative in Cosmic Consciousness – Atman and the world, the second perhaps seen as illusion.
1 – the Oneness of Unity
0 – Brahman, beyond being and non-being, nothing or zero.
In a sense, the number zero is a better representation than “nothing” for it is the ground and source of all numbers. He observed that while Brahman was difficult to speak of and impossible to grasp, even for someone in Unity, it was good to speak of it as it was important for Being to know there was more, beyond itself. “Beyond the beyond”.