Idle cutoff

The mixture position that stops fuel flow, used to starve an engine fire.

As taught in Fire, Smoke and Electrical Failures (Abnormal and Emergency Considerations) — a free lesson with cited FAA sources.

The mixture position that stops the engine during a normal shutdown.

As taught in Postflight: After Landing, Shutdown and Securing (Preflight and Postflight Procedures) — a free lesson with cited FAA sources.