DJ : Short for dust jacket, a protective and often decorative wrapper, usually made of paper which wraps around the binding of a book.

book club edition : A generic term denoting a book which was produced or distributed by one of any number of book club organizations. Usually the overall quality of the book's materials is lower than the same book as printed by a traditional publishing house.

shelf wear : Minor wear resulting from a book being place on, and taken from a bookshelf, especially along the bottom edge.