The part of the book that follows the text pages. This generally includes reference material such as notes, bibliography, references, appendixes, glossary, and index.

Elements of a book that follow the text proper. Backmatter may include the appendix, notes, glossary, bibliography and other references, lists of resources, index, author biography, offerings of the author’s and/or publisher’s additional books and other related merchandise, and colophon.

Any text that appears after the main text of the book. This can include the afterword, appendix, glossary, or index.

Unread verbiage. (See also SPINE)