- storage object
- storage organization
- storage system
- stored program
- stratum
- strays
- streaking
- stream-file
- streamlining
- stretch
- stretched pulse
- strident delivery
- striking
- string
- strobe pulse
- strong coupling
- strowger system
- structure chart
- stub
- study programme
- stuffing character
- sub-carrier
- sub-network
- sub-refraction
- sub-storm
- subchannel
- subframe
- subheader
- subjective test
- submillimetre wavelengths
- subordinate posts
- subscriber
- substrate
- subsystem
- successive difference
- sum storage
- summing network
- summing point
- sun-synchronous
- sunset
- superconductor line
- superluminessence
- strip coil
- stripline antenna
- stroke text
- structural flexibility
- stuffing digit
- style sheet
- stylus
- sub-allocation
- sub-function
- sub-station
- subband coding
- subcontract
- subroutine call
- subscriber service
- subscription
- substitution
- subterranean propagation
- summation network
- strut
- stub cable
- stuffing
- stuffing rate
- sub-addressing
- submarine cable
- submerged nozzle
- submultiplex
- subnetwork
- subpoint track
- subsat
- subsidiary accounts
- substitution oscillator
- substitution rule
- successful call
- strong inversion
- stub antenna
- stuffing device
- sub-assembly
- sub-band
- sub-channel
- subarea
- subfield
- subharmonic function
- subjective grading
- subsonic
- sun burst
- Sun pulse
- Sun seeker
- sun sensor
- sun tracker
- sun-blind
- sunspot
- sunspot minimum
- super-refraction
- superconductor cable
- supergroup frequency
- superheterodyne receiver
- supersonic frequency
- supersonic nozzle