The term 'BIBLICAL BK' refers to four books of the Bible: Revelation (REV), Exodus (EXOD), Isaiah (ISA), and Ezekiel (EZEK). These books are part of the Christian Old Testament, and are among the most important and influential books in the Bible. Revelation is the last book of the New Testament, and is known for its vivid imagery and prophecies. Exodus tells the story of the Israelites' escape from slavery in Egypt. Isaiah is a collection of prophecies and teachings, while Ezekiel is a book of visions and prophecies.