"signals" - key terms from Wikipedia

analog signals
analogue signals
audio signals
block signals
byte select signals
cf signals
control signals
converted into a signals	vehicle
corps of signals
delayed signals
digital signals
efferent signals
emg signals
fiber signals
foreign instrumentation signals
front turn signals
galileo signals
gps signals
gurkha signals
hand signals
interfering signals
international code of signals
misery signals
nonverbal signals
pain signals
pci bus signals
q signals
radio signals
rear turn signals
rgb signals
road signs and signals
secam signals
separate signals
sequential turn signals
signals
signals	intelligence
signals	squadron
smoke signals
speech signals
strength signals
television signals
time signals
traffic signals
turn signals
tv signals
uhf signals
unwanted signals
video signals
visibility signals
weak signals