Light switch
A light switch was a type of switch used for turning a light bulb on and off. They were generally screwed or nailed into the wall of a room, close to the door to that room.
In 2024, there was a light switch in the room that Jean-Luc Picard was put in at the Clinica Las Mariposas after he was struck by a car. (PIC: "Monsters")
Mila had difficulty locating the room's light switch, in 2375, as she brought Elim Garak and members of the Cardassian Rebellion to the cellar of his childhood home. (DS9: "The Dogs of War")