thin - tone
- thin film
- thin paper
- thin space
- thin-film memory
- thin-film storage
- thin-route telephony
- third party on hold
- third wire
- third-order distortion
- third-order high density bipolar
- third-order high density bipolar code
- third-order high-density bipolar coding
- third-wire control
- thirty-two-mo
- Thomson bridge
- Thomson effect
- thousands-group
- thrashing
- thread
- three-bit byte
- three-condition cable code
- three-condition telegraph code
- three-conductor cable
- three-dimensional direction-finding
- three-dimensional radar
- three-input adder
- three-link international call
- three-party conference
- three-phase counter
- three-phase current
- three-phase line
- three-phase mesh connection
- three-phase rectifier
- three-phase to DC converter
- three-point connection
- three-pole plug
- three-sided cutting machine
- three-slot winding
- three-state port
- three-term control
