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

spine : The outer portion of a book which covers the actual binding. The spine usually faces outward when a book is placed on a shelf. Also known as the back.

price-clipped : The portion of the dust jacket flap where the publisher prints the suggested price has been cut away. Usually this is a clean 1-2" diagonal cut made with scissors.