heli - holo
- helical antenna array
- helical recording track
- helical resonator
- helical resonator filter
- helical scan recording
- helical scan video recording
- helical-scan vtr
- helium neon laser
- helix antenna
- helix feed
- helix format
- hermetic housing
- hertz dipole
- hertz radiator
- hertzian dipole
- heter ojunction diode
- heterodyne harmonic
- heterodyne repeater
- heterodyne repeating
- heterodyne signal
- heterodyne wavemeter
- heterodyning
- heterojunction
- heterojunction led
- heterojunction photodiode
- heterojunction phototransistor
- heterojunction transistor
- heuristic
- heuristic method
- heuristic model
- hexadecimal number
- hf compensated amaplifier
- hf noise
- hf noise suppression
- hf oscillator
- hi-fi
- hi-fi tuner
- hi-fi tv set
- hi-fi-television
- hidden defect
