Henology

Henology is the philosophical account or discourse on the One that appears most notably in the philosophy of Plotinus. Reiner Schürmann describes it as a "metaphysics of radical transcendence" that extends beyond being and intellection.

Areas of inquiry
Henology stands in contradistinction to several other philosophical disciplines. The term henology refers to the discipline that centers around The One, as in the philosophies of Plato and Plotinus. It is sometimes used in contradistinction to disciplines that treat being as their starting point (as in Aristotle and Avicenna), and also to those that seek to understand knowledge and truth (as in Kant and Descartes).