Lucifer

Literally the Shining One; also Lightbringer or Son of the Morning. Lucifer is also known as Satan or the devil. The name Lucifer appears only once in the Bible (Isa. 14:12; compare Luke 10:18). Apparently Lucifer is the name of the devil before his rebellion and fall. Latter-day revelation clarifies the fall of Lucifer and equates him with Satan (D&C 76:25–38; see also Rev. 12; 2 Ne. 9:8; D&C 29:36–38; Moses 4:1–4).