Hypostasis (plural: hypostases), from the Greek ὑπόστασις (hypóstasis), is the underlying, fundamental state or substance that supports all of reality. It is not the same as the concept of a substance. In Neoplatonism, the hypostasis of the soul, the intellect (nous) and "the one" was addressed by Plotinus. In Christian theology, the Holy Trinity consists of three hypostases: that of the Father, that of the Son, and that of the Holy Spirit.
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Prosopon is a theological term used in Christian theology as designation for the concept of a divine person. The term has a particular significance in Christian triadology (study of the Trinity), and also in Christology.
In English language, the form prosopon is used mainly in scholarly works, related to theology, philosophy or history of religion, while it is also commonly translated as person, both in scholarly or non-scholarly writings. The term prosopon should not be confused with the term hypostasis, which is related to similar theological concepts, but differs in meaning.