G

Gasket:

A component made from an elastomer, such as rubber, to provide an environmental seal in the interface of a connector pair. Also called a "grommet".

Giga:

A numerical prefix denoting one billion (109)

Graded Index Fiber (Fiber Optic):

A multimode fiber whose core refractive index increases in controlled fashion outward from the axis and matches the cladding refractive index at the core-clad interface. Has greater bandwidth than step index fiber, but less bandwidth than single mode fiber.

Ground (GRD):

An electrical term meaning to connect to the earth or other large conducting body to serve as an earth, thus making a complete electrical circuit. Sometimes at zero potential or voltage.