Left. Repeater bulb. Right. A Light Bulb for a courtesy Light. A Light Bulb for a side marker Light. A Light Bulb for a turn signal. A Light used on a vehicle used to aim Light in the direction the vehicle is traveling in order to provider greater visibility. Part included in side marker lamp. Cornering Lamp. Courtesy. Exterior S. Repeater. Side Marker. Turn Signal. Turning Lamp. Included with: Headlamp assembly.