vg : Very Good condition. can describe a used book that does show some small signs of wear - but no tears - on either binding or paper. Any defects must be noted. (defined by AB Bookman's Weekly)

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.

sunned : The affected portion of the book has been discolored from exposure to the sun.