The literal meaning is simply "a nod", or more accurately,"that which is produced by nodding". In the same way, "flamen" is "that which is produced by blowing", "i.e.", a gust of wind. It came to mean "the product or expression of power" — not, be it noted, power itself."Numen" (divinity) is not personified (although it can be a personal attribute) and should be distinguished from "deus" (god).