A handheld power tool with a rotating bit is known as a rotary tool. Rotary tools may have a cord or be cordless, and power accessories for drilling, sanding, carving, cutting, grinding, or routing are available.
A blue, cordless rotary tool is designed to be used by hand. Craftsman will place the correct bit on the rotary tool depending upon whether it's being used for sanding, rounding, smoothing, or polishing.
Antique airplanes are reminiscent of an era gone by. This photo shows the rotary motor and wooden propeller of a red World War I era biplane that is on display at the Air & Space Museum in San Diego's Balboa Park.