A steam locomotive.
A piston engine driven by steam (as contrasted, for example, with a steam turbine).
Any heat engine that uses steam as its primary working fluid to do mechanical work.
A railway locomotive used for shunting; a shunter.
A switchmode power supply.
Synonym of vision mixer (“device for selecting between video sources”)
One who or that which operates a switch.
One who or that which switches, or changes to something else.