A fire alarm on the wall (left)
A fire alarm was a device that, when pulled, alerted people in a building or aboard a starship to the presence of a fire so that they could evacuate or take other appropriate measures.
In 1986, Mercy Hospital was equipped with fire alarms. (Star Trek IV: The Voyage Home)
Signage on the doors aboard the Earth Cargo Service freighter ECS Fortunate instructed to behave during an emergency procedure. In the event of fire, the fire alarm should be activated and the area should be evacuated. The fire control personnel's arrival should be awaited. (ENT: "Fortunate Son")