The proportion of the left to right wheel while cornering. During a left turn, the right front wheel has to travel around a radius which is larger than that of the inside wheel. This requires the inside wheel to turn at a sharper angle than the outside in order for both wheels to effectively track. The ackerman a car has dialed into it is what causes this to occur, and can be seen while holding a car and turning the wheels from the neutral steering point to either side. The inside wheel should turn sharper when the wheel is turned as far as it will go. On some cars, this is adjustable by either shimming the steering rack, or by using one of the multiple locations on the steering knuckle or rack.