A Ampere

ABC Active body control

ABDC After Bottom dead centre

ABS Anti-lock braking system

AC Air conditioning

ACC Adaptive cruise control

A/F Air to fuel (ratio)

AFR Air to fuel ratio

ARB Anti-roll bar

ASC Automotive stability control, also known as Electronic stability control

ASR Anti-slip regulation

ABDC After bottom dead centre

ATDC After Top dead centre

AWD All Wheel Drive

AYC Active yaw control