Beef Silver Side

Silverside is a bone out cut of meat from the rear leg (hind quarter) of the cow

To be specific it is situated lateral/caudal to the femur bone and attached to the os coxae (aitchbone) and is removed by following the natural seam between the Thick Flank and Topside.
In most parts of the U.S., this cut is known as outside or bottom round

Its used as for roast and It may also be thinly sliced for a minute steak