- signal electrode
- signal envelope
- signal expansion
- signal extension
- signal fading
- signal field
- signal function
- signal generation
- signal generator
- signal glass
- signal ground
- signal handler
- signal identification
- signal indicator
- signal injection
- signal injector
- signal installation
- signal intensity
- signal interlocking
- signal interval
- signal inverter
- signal label
- signal lamp
- signal lens
- signal level
- signal lever
- signal light
- signal line
- signal locker
- signal loss
- signal man
- signal margin
- signal mask
- signal mast
- signal message
- signal multiplexing
- signal mutilation
- signal name
- signal normalization
- signal operator
- signal panels
- signal phase
- signal pipe
- signal pistol
- signal plate
- signal pole
- signal post
- signal power
- signal processing
- signal processor
- signal pulse
- signal receiver
- signal regeneration
- signal regenerator
- signal regulation
- signal relay
- signal restoration
- signal saturation
- signal selector
- signal shaping
- signal simulation
- signal simulator
- signal space
- signal spacing
- signal speed
- signal splitter
- signal standardization
- signal standards
- signal station
- signal strength
- signal structure
- signal supply
- signal symptom
- signal synthesis
- signal threshold
- signal tower
- signal tracing
- signal traffic
- signal transducer
- signal transformation
- signal transmission
- signal tube
- signal velocity
- signal voltage
- signal wave
- signal winding
- signal-fire
- signal-flag
- signal-gun
- signal-men
- signalement
- signaler
- signaling
- signaling alphabet
- signaling apparatus
- signaling bit
- signaling channel
- signaling code
- signaling current
- signaling device