a board for displaying electrically transmitted signals and indicating their source.
noun, British. 1. a railway signal tower. noun 1. a building containing manually operated signal levers for all the railway lines in its section 2. a control point for a large area of a railway system, operated electrically and semiautomatically
noun 1. a branch of the army responsible for military communications, meteorological studies, and related work.
noun 1. anything that serves to indicate, warn, direct, command, or the like, as a light, a gesture, an act, etc.: a traffic signal; a signal to leave. 2. anything agreed upon or understood as the occasion for concerted action. 3. an act, event, or the like that causes or incites some action: The unjust […]
- Signal generator
noun 1. (electrical engineering) an apparatus used to generate a signal consisting of a known oscillating voltage, usually between 1 microvolt and 1 volt, over a range of frequencies, to test electronic equipment