induction coil

1. A transformer that produces a high voltage alternating current pulse from a low voltage direct current supply, especially such a device in the starter motor of an automobile.

   a coil for producing a high voltage from a low-voltage source

2. A pattern, often unstable itself on its own, that stabilizes an unstable pattern's edge(s) without directly touching it by preventing cells that would destabilize it from becoming alive.

regular