Most typical, both traditional and modern, applied handles come in all shapes and sizes, and can be made from almost any material that you may desire.
Most groove handles use a C or L shape, based on preference or function. They are generally found on an extruded base frame and work as part of the door, relieving the need for an applied handle.
This system is another which reduces the need for applied handles. It works via a pressure piston which is fixed behind the cabinet doors, some systems incorporate magnets.