21:3021:30, 1 September 2017diffhist−12
Anti-lock braking system
Uh, wrong. It's simply the plural of "ABS" (anti-lock braking systemS), the same way as the plural of "ATM" is "ATMs" (automatic/automated teller machineS), or VINs (vehicle identification numberS), or PINs, etc., except adding the e.