Perfect prime rib. Stephen Walls / Getty Images. Prime rib is a classic roast beef preparation made from the beef rib primal cut, usually roasted with the bone in and served with its natural juices (au jus). Restaurants that serve prime rib are required to use beef that has been graded prime by the USDA.
The Fast Lane Answer. A ZIP Code is a group of five or nine numbers that are added to a postal address to assist the sorting of mail. A complete, 9-digit ZIP Code, including its additional four digits (called a ZIP+4 Code), is the designation of a delivery route.
The term ZIP code was originally registered as a servicemark (a type of trademark) by the U.S. Postal Service, but its registration has since expired. USPS style for ZIP is all caps, although style sheets for some publications use sentence case or lowercase.