grou - high
- heliostat
- heliostat field
- heliotype
- helipad
- heliport
- helium
- helium (ionization )detector
- helium (ionization )detector
- helium arcjet
- helium ash
- helium circulator
- helium coolant passage
- helium cooled
- helium cycle
- helium cylinder
- helium density of catalyst
- helium magnetometer
- helium management system
- helium pool
- helium refrigerator