- synchronous vibrator
- synchrophasotron
- synchrotron
- synchrotron radiation
- synodic month
- synthesis
- system capacity
- systematic distortion
- T attenuator
- t-square
- tachometer
- tachometry
- tachymetry
- tackiness
- tagged
- tally system
- tank
- switching clock
- switching device
- symbolic dynamics
- synchro-clock
- synchrotron accelerator
- synodic period
- synthetic lubricant
- syphon
- system moisture
- system timer
- system water
- systematics
- T pad
- T-circuit
- tabular
- tachymeter
- Tafel slope
- tamper
- tandem
- tandem mirror
- tank cooler
- tank voltage
- tantalum capacitor
- tap changing
- tap switch
- tapped resistor
- tapping
- tapping range
- tangent
- tangential velocity
- tank capacitor
- tap
- tap charger
- taper
- tapped transformer
- target scintillation
- tau-meson
- tautochrome
- tautomer
- tautomerism
- Taylor connection
- TE mode
- teaser transformer
- technical atmosphere
- Taylor development
- technetium
- technical load
- telecamera
- telecentric
- telecommunication terminal
- teleconferencing
- telegoniometer
- swirl strip
- switch-fuse
- switching rate
- switching station
- switching trunk
- symmetrical components
- symmetrical state
- synchro transmitter
- synchronizing coefficient
- synchronous condenser
- synchronous process
- synchronous reactance
- synchrotron process
- system function
- T circulator
- T-network
- T-wire
- tachogenerator
- talc
- tamping
- tanning
- target echo
- target glint
- target noise
- target technology
- target volume
- tariff
- telegraph concentrator
- telegraph distributor
- telegraph receiver
- telegraph repeater