propeller

This word describes a mechanical device that converts rotational motion into linear thrust. It carries a strong association with industrial power and propulsion, evoking the visual of a spinning blur and the audible hum of an engine. In modern conversation, it is often contrasted with jet engines or turbines. While a jet pushes gas backward, a propeller physically grips and displaces the surrounding medium to pull or push the craft forward, making it the primary symbol of early aviation and maritime travel.