In the Bible 'Lucifer' is a title given to the king of Babylon. It means 'The morning star'. It only appears once in the Bible, in Isaiah 14:12, in the KJV.

"How art thou fallen from heaven, O Lucifer, son of the morning!" (Isaiah 14:12, KJV).

"How you have fallen from heaven, O morning star, son of the dawn!" (Isaiah 14:12, NIV).