One of the mysteries of the English language finally explained.
A projection, an emanation; specifically either of the Son and Holy Spirit of the Trinity, regarded as emanating or projecting forth from the Father; (also) this manner of conceptualizing the second and third persons of the Trinity.
Late 17th century; earliest use found in William Sherlock (d. 1707), Church of England clergyman and religious controversialist. From post-classical Latin probola (late 2nd or early 3rd cent. in Tertullian) and its etymon Hellenistic Greek προβολή emanation, projection, especially of the Son from the Father, specifically use of ancient Greek προβολή projection.
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