- functional test
- fundamental emission
- fundamental frequency
- gain droop
- gain factor
- galactic radiation
- gang punch
- gap length
- gas discharge
- gate bias
- gate density
- gated signal
- gateway node
- gating signal
- Gaussian curve
- Gaussian filter
- Gaussian interference
- Gaussian pulse
- Gaussian spectrum
- general accounts
- gas maser
- gas phototube
- gas ratio
- gas triode
- gas tube
- gate system
- gated diode
- gateway exchange
- gating pulse
- Gaussian noise
- gate dielectric
- gating transistor
- Gaussian distribution
- Gaussian fading
- general factor
- general fund
- general parameters
- general rule
- generating pair
- gentex network
- geographical distribution
- geomagnetic latitude
- geometrical average
- geodetic network
- geomagnetic storm
- geostationary
- germanium diode
- gimbaled nozzle
- glass substrate
- global search
- globular cluster
- geocentric spacing
- geodetic satellite
- geographical sharing
- geomagnetic activity
- geomagnetic equator
- GEOPAUSE satellite
- geostationary satellite
- geosynchronous
- gimbals axis
- GigaByte
- gimbals
- glass laser
- glide path
- global call
- global code
- general meeting
- general program
- generating polynomial
- generation feature
- GEOLE satellite
- geomagnetic disturbance
- ghost
- gigahertz
- gimbals angle
- global processor
- gold epoxy
- gold franc
- Gold standard
- gold value
- go channel
- grand tour
- grant
- granular noise
- graphic calculation
- graphic data
- graphic information
- graphic mode
- graphic package
- graphic pad
- graphic recording
- graphic representation
- graphic symbol
- graphical integration
- graphics icon
- grappling
- graticule
- grating
- governing body
- grace period