Spark plugs with V-cut: they need lower voltage for the ignition
Spark plug with V-cut in the Center electrode, technological solution that makes the spark to jump from the ends of the Center electrode to achieve a better burning of mixture air/fuel.
It is especially useful in modern engines that mix set at maximum air/fuel to achieve a reduction in the emission of exhaust gases.
Requires a lower voltage for the ignition, which produces a better combustion.