The author of the work provided no title for it. However, a title came into usage from the first word of the book in Koine Greek: apokalypsis, meaning "unveiling" or "revelation".
It is also known as the Book of the Revelation of Saint John the Divine or the Apocalypse of John (both in reference to its author), or the Book of the Revelation of Jesus Christ (in reference to its opening line), or simply Revelation (often erroneously called Revelations in contrast to the singular in the original Koine), or the Apocalypse.