Gear is a mechanical device that transmits power and motion between axes.

Gyroscope navigation systems that use an internal gyroscope to track the turns a vehicle makes, which helps the system determine the direction in which a vehicle is traveling.

GM/GMO Genetically modified/Genetically modified organism refers to genetic material which has been altered in a way which does not happen naturally.

Gravel is a term used to describe unconsolidated sediments composed of rock fragments. These rock fragments have a size that is greater than 2 millimeters.

A goat is a mammal in the genus Capra, which consists of nine species: the Ibex, the West Caucasian Tur, the East Caucasian Tur, the Markhor, and the Wild Goat.

Gauge is in meteorology, a general term for any device that measures, strength of wind, pressure, and other parameters. TThe most widespread gauges on meteorology are barometer gauge, density-of-snow gauge dew gauge, and other gauges that measures distance, rain and snow, rain intensity and wind.

Gearbox, also known as a gear case or gearhead pertains to a gear or a hydraulic system responsible for transmitting mechanical power from a prime mover (an engine or electric motor), into some form of useful output. It is referred to the metal casing in which a number of gears are sealed.

Gemstone (Gem) is described as precious or semiprecious stone that may be used as a jewel when cut and polished. It includes diamond, beryl, emerald, chalcedony, agate, onyx, tourmaline, chrysolite, sapphire, ruby, spinel, topaz, turquoise, zircon, cubic zirconia, jacinth, hyacinth, carbuncle, amethyst, alexandrite, cat's eye, bloodstone, hematite, jasper, moonstone, sunstone, and many others.

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