alarm signal system
21Manual fire alarm activation — Single action pull station. A manual call point in the UK …
22Global Positioning System — GPS redirects here. For other uses, see GPS (disambiguation). Geodesy Fundamentals …
23Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… …
24nervous system, human — ▪ anatomy Introduction system that conducts stimuli from sensory receptors to the brain and spinal cord and that conducts impulses back to other parts of the body. As with other higher vertebrates, the human nervous system has two main… …
25Fire alarm pull station — A fire alarm pull station is an active fire protection device, usually wall mounted, that, when activated, initiates an alarm on a fire alarm system. In its simplest form, the user activates the alarm by pulling the handle down, which completes a …
26Fire alarm box — A fire alarm box is an outdoor device used for notifying a fire department of a fire. Early boxes used the telegraph system and were the main method of calling the fire department to a neighborhood in the days before people had telephones. When… …
27fire alarm — 1. a signal that warns that a fire has started. 2. a bell, buzzer, siren, horn, etc., that provides such a signal. [1840 50, Amer.] * * * means of warning in case of fire. Originally, watchmen provided the only fire alarm system, but, with… …
28Panic alarm — A panic alarm is an electronic device designed to assist in alerting somebody in emergency situations where a threat to persons or property exists. A panic alarm is frequently but not always controlled by a concealed panic alarm button. These… …
29burglar alarm — noun 1. a loud warning signal produced by a burglar alarm they could hear the burglar alarm a mile away • Hypernyms: ↑alarm, ↑alert, ↑warning signal, ↑alarum 2. a warning device that is tripped off by the occurrence of a burglary • Hypernyms: ↑ …
30Immune system — A scanning electron microscope image of a single neutrophil (yellow), engulfing anthrax bacteria (orange). An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and… …
