A spark plug for vehicle may include a ground electrode, and a center electrode for cooperating with the ground electrode. The center electrode may include a spline member and the ground electrode may include an inward extending projection member. The spline member and the inward extending projection member may cooperate to generate a spark for the vehicle, and the spline member may be a male spline member. The center electrode may include a plurality of spline members spaced around the periphery of the central electrode, and the ground electrode may include a plurality of inward extending projection members spaced around the periphery of the ground electrode. The ground electrode may include a cylinder.
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