The term "verso" refers to the left-hand page of an open book or manuscript. In the context of printed materials, it is the side that is opposite the "recto," which is the right-hand page. The verso typically contains text, illustrations, or other content, and is often numbered with even page numbers. In publishing, understanding the distinction between verso and recto is important for layout and design. For example, in a book, the first page on the right is the recto, while the second page on the left is the verso. This terminology is also used in art and manuscripts to describe the sides of a sheet of paper.