Holy Trinity

picture source: Paul Laffoley

Within Christianity, the doctrine of the Trinity states that God is a single "Being" who exists, simultaneously and eternally, as a communion of three persons (personae, prosopa): Father (the Source, the Eternal Majesty); the Son (the eternal Logos or Word, incarnate as Jesus of Nazareth); and the Holy Spirit. Traditionally, in both Eastern and Western Christianity, this doctrine has been stated as "One God in Three Persons," all three of whom, as distinct and co-eternal "persons" or "hypostases," share a single Divine essence, being, or nature.

source: Wikipedia