Printed paper case (PPC)
An alternative to cloth casing for hardbacks in which a paperback-like cover (but on much thinner paper) is glued on to the stiff boards and laminated in place. As a result, no protective jacket is necessary.
Subversive publishers like NIAS Press prefer hardbacks with a printed paper case so that librarians are unable to throw away the outer soul of the book, which they could (and would) do if it were a jacket they were dealing with. There are good reasons for this attitude, however, as you will see by reading the below-mentioned post.
This definition is extracted (and expanded on) from the book Getting Published: A Companion for the Humanities and Social Sciences by Gerald Jackson and Marie Lenstrup. It was first referred to in the blog Getting Published in a post on book covers.