- service signal
- service symbol
- servo amplifier
- servo equipment
- session collection
- session library
- session limit
- session monitor
- session parameter
- set mode
- set time
- setting out
- setup program
- shallow entry
- servicing staff
- serving exchange
- servo
- servo basis
- servo-mechanism
- session connector
- session group
- session manager
- session path
- session segment
- session termination
- set
- set selection
- SETI station
- settlement
- shadow cone
- shape beam
- shape factor
- shaped beam
- shaped pulse
- shaped reflector
- shaping
- shaping amplifier
- shaping filter
- shared resources
- sharing criterion
- sharp directivity
- sheath tab
- sheet detector
- shielding effect
- shift frequency
- shift-right
- shift-SI
- shimmer
- sheath
- shielded chamber
- shift pulse
- shift-left
- ship station
- shock pressure
- shock structure
- short cutoff
- short time
- shot noise
- side-scatter
- sideband attenuation
- sideband interference
- sidetone
- signal amplitude
- signal bandwidth
- signal clipping
- signal comparison
- signal compression
- signal concentrator
- signal converter
- signal detector
- signal digitization
- signal duration
- signal edge
- signal envelope
- signal expansion
- signal field
- signal ground
- signal loss
- signal message
- signal multiplexing
- signal mutilation
- signal pipe
- signal power
- signal receiver
- signal regeneration
- signal space
- signal strength
- signal synthesis
- signal tube
- signaling
- signaling alphabet
- signaling bit
- signaling channel
- signaling network
- signaling set
- signaling speed
- signaling time
- signalling key
- signalling layer
- significance level