Which term refers to the mechanism that allows for steering angle adjustments?

The term that refers to the mechanism allowing for steering angle adjustments is rack and pinion. The rack and pinion system is essential in converting the rotational motion of the steering wheel into the linear motion needed to turn the vehicle's wheels. This system consists of a circular gear (the pinion) and a flat bar with gear teeth (the rack). When the driver turns the steering wheel, the pinion turns and engages the teeth on the rack, moving it side to side and thus adjusting the angle of the wheels in response.

Other components listed, while important in the overall steering and suspension system, do not specifically provide the mechanism for steering angle adjustments. The Pitman arm is part of the steering linkage but does not directly affect the adjustment of the steering angle. The steering gear refers to the entire assembly that includes the rack and pinion but does not denote the mechanism by itself. Similarly, the control arm is part of the suspension system and primarily serves to connect the vehicle's chassis to the wheels, affecting wheel alignment and suspension dynamics rather than steering angle directly.