Automobile spark plug: electric part generating sparks to ignite an internal combustion engine.
Ceramic insulator: pottery support for the parts that conduct electricity.
Terminal: place where a current-conducting wire is attached.
Spline: hollow channel.
Resistance: device that controls the strength of the current.
Ground electrode: current device that unites the electrodes.
Spark plug gap: space separating the current conductors.
Center electrode: central current conductor.
Gasket: spot where two part join together.
Spark plug body: metal part of the spark plug.
Hex nut: hexagonal piece of metal used to screw in a spark plug.