sign - son
- sign ambiguity
- sign amplifier
- sign bit
- sign change
- sign off
- sign on
- sign selector
- sign-changing amplifier
- sign-off
- sign-on
- sign-reversing amplifier
- signal
- signal a message
- signal ambiguity
- signal amplitude
- signal amplitude limiter
- signal analysis
- signal analyzer
- signal and engineering planning
- signal bias
- signal book
- signal brigade
- signal button
- signal cable
- signal cavity
- signal channel
- signal circuit
- signal code
- signal code combination
- signal communication
- signal communications center
- signal communications equipment
- signal communications support
- signal comparator
- signal compression
- signal conditioner
- signal construction
- signal conversion analog equipment
- signal conversion equipment
- signal conversion line equipment
