1) Auto part 2) Human-machine interaction 3) Use it to find the right path 4) What a driver grips 
A steering wheel (also called a driving wheel or a hand wheel) is a type of steering control in vehicles and vessels (ships and boats). Steering wheels are used in most modern land vehicles, including all mass-production automobiles, as well as busses, light and heavy trucks, and tractors. The steering wheel is the part of the steering system that...
(from the article `automobile`) Automobiles are steered by a system of gears and linkages that transmit the motion of the steering wheel to the pivoted front wheel hubs. The gear ...
[n] - a handwheel that is used for steering
noun a handwheel that is used for steering
a wheel used by a driver, pilot, or the like, to steer an automobile, ship, etc.