The 7-bone roast (also known as the center-cut pot roast) includes a cross cut of the shoulder blade or churck. The bone is shaped like the numeral "7", which gives these cuts their name. These cuts are more suitable for braising and cooking with liquids. 
 
For some interesting ways to prepare 7 Bone Pot Roast check out these recipes:
HORSERADISH-BRAISED POT ROAST WITH BARLEY & KALE 
 
CROCK POT 7-BONE ROAST