A book leaf is a single sheet of paper in a book, usually bound between two other PAGES. The term PAGE refers to one side of a book leaf, while FOLIO is the term used to refer to both sides of a book leaf. Recto is the term used to refer to the right-hand PAGE of a book leaf, while verso is the term used to refer to the left-hand PAGE. PAGES is the term used to refer to multiple book leaves, and EDEN is the term used to refer to a blank PAGE in a book.