| A torsion bar spring connecting the suspension on either side of the vehicle. When a vehicle rolls on the side and a turn, the suspension at the out side wheel compresses and the suspension at the inside wheel extends. The stabilizer bar that connects them twist to apply a counteracting forced to hold the vehicle closer to level. | |
| Alternating current | |
| A mechanical or electrical driven propeller that draws air through the radiator. | |
| Balancing a part while it is in motion. |