Signal

Signal is:

Signal, an optical or acoustic signal
Signal ( computer ), a system message
Signal ( UML), a model element in UML
An electrical signal, usually a time-dependent electric quantity
Radio signal modulated electromagnetic waves
Signal ( magazine ), a Nazi propaganda magazine
Signal (Traffic magazine ), a transport policy journal of the Berlin passenger Association IGEB, sometimes with the involvement of Deutsche Bahn customers Association
Signal ( AFCEA ), Association official magazine of the Armed Forces Communications and Electronics Association ( AFCEA )
A colloquial name of the railway signal
Signal Iduna, an insurance company
A toothpaste brand from Unilever
In French-speaking Switzerland for the signal points otherwise known as high Wachten

Signal indicates the following mountains: