Gaffer (2):
Industrial-strength sticky tape, AKA duct tape.
Gauss:
(pronounced "gows", abbreviation "G") Unit of magnetic induction.
Gel:
(pronounced "jel") Semi-transparent heat-resistant material which is placed in front of a light source in
order to modify it's colour temperature or other characteristics.
Related info: Color Temperature
Geosynchronous:
A satellite orbit in which the satellite remains in a fixed position above the Earth.
Graphic Equalizer:
A type of audio equalizer which uses a graphical layout to represent the changes made to various frequencies.
More info: Graphic Equalisers, Sound Equalization
Gray Card:
A gray-coloured card which reflects a known, uniform amount of the light which falls upon it. Used as a reference to calibrate light meters and set exposure.
More Info: Grayscale Chart, 18% Gray Card
Gray Noise:
Random noise, similar to white noise, which has been filtered to make all frequencies appear equally loud to the human ear.
More info: Gray noise, Noise colors
Green Noise:
An unofficial term referring to the background ambient noise of the world. Can also mean the mid-frequencies of white noise.
More info: Green noise, Noise colors
Green Room:
A room located near the main stage in a studio or concert venue, where artists and guests wait before their appearance.
More info: Green room
Green Screen:
A film and video technique in which action is shot against a green screen, which is subsequently removed from the image and replaced with a different background.
More info: Green Screen , Chroma Key
Grip:
Person who is responsible for constructing and dismantling film sets, as well as laying down dolly tracks.