"signal" -
key terms from Wikipedia
analog
signal
audio
signal
block
signal
cab
signal
chief
signal
officer
clock
signal
control
signal
digital
signal
digital
signal
processing
digital
signal
processor
distant
signal
distress
signal
electrical
signal
federal
signal
hand
signal
home
signal
input
signal
main
signal
optical
signal
output
signal
radar
signal
radio
signal
received
signal
signal
signal
battalion
signal
box
signal
brigade
signal
company
signal
corps
signal
handler
signal
hill
signal
iduna
park
signal
integrity
signal
mountain
signal
officer
signal
processing
signal
processor
signal
publications
signal
regiment
signal
squadron
signal
station
signal
strength
signal
transduction
starting
signal
stop
signal
threat
signal
time
signal
traffic
signal
turn
signal
video
signal