τὸ ἕν · The One

Not the first thing in a list of things — the source of there being any things at all. It has no parts, no extension, no attributes, and strictly no name; "the One" and "the Good" are what we call it for want of anything better. It does not know itself, because knowing takes two.

The direct ancestor of Ein Sof, by a route this pack names. The likeness here is not convergence; it is inheritance.