- supervision
- supervisor call
- supervisor password
- supervisor signal
- supervisory aid
- supervisory channel
- supervisory message
- supervisory responsibility
- supervisory timer
- supervisory tone
- supplemental angle
- supplementary estimates
- supplementary group
- supplementary service
- supply function
- supply line
- supply reel
- support cost
- suppressed carrier
- suppression factor
- suppression grid
- suppression ratio
- suppressor
- suppressor grid
- supreme authority
- surface accuracy
- surface channel
- surface connection
- surface cooling
- surface current
- surface noise
- surface refractivity
- surface tolerance
- surface value
- surge
- substitution point
- sudden failure
- sun interference
- superconducting cavity
- superconducting device
- superconductor oscillator
- superfluous signal
- supergroup level
- superheterodyne
- superimposed code
- surplus expenditure
- surplus income
- surround
- surveillance
- survivability
- survival craft
- suspend mode
- suspense account
- swap
- swath
- sweep
- sweep antenna
- sweep coverage
- sweep excursion
- sweep frequency
- sweep mode
- sweep period
- sweep range
- sweep rate
- sweep signal
- sweep time
- sweeping device
- switch character
- switch code
- switch indicator
- switch-hook
- switchboard
- switchboard operator
- switchboard panel
- switched laser
- switched network
- switched service
- switching apparatus
- switching center
- switching circuit
- switching element
- switching exchange
- switching layer
- switching matrix
- switching network
- switching stage
- switching variable
- swiveling nozzle
- syllabic compandor
- syllabic rhythm
- symbol rate
- symbol string
- symbolic editor
- symbolic pointer
- symmetrical relation
- symplectic mapping
- synchronisation word
- synchronization method
- synchronization pattern
- synchronization window