Kether.

The Godhead, it is the eternal self that crowns all being. It rules over all because it simply is, and needs nothing more than its ultimate ‘is-ness’. The perfection of a point, wholly disconnected from all other points, as it has nothing to judge itself against, therefore is blameless, formless and limitless, as it can not form any other judgments besides its own inherent perfection. Theoretically the whole of universe, at some magnitude, is merely one point, completely perfect in itself. This is what is meant by the sephiroth kether.