g Acceleration of gravity / Accélération de la pesanteur

g Gram / Gramme (1 gram = 0.001 Kilogram = 0.0353 ounce)

G Giga (prefix) (10⁹ = 1 000 000 000)

Gal Gallon (1 gallon US = 3.7853 liters = 0.02381 barrel)

Gb Gigabyte 2³⁰ = 1,073,741,824 bytes = 1 048 576 kbytes = 1 024 megabytes

Gbps Gigabits Per Second

GBq Gigabecquerel

GCV Gross Calorific Value

GFLOPS 1 gigaflop = 1 billion (10⁹) floating point operations per second.(measure of computer processing capability)

Gg Gigagrams (thousands of tonnes)

GHz GigaHertz

Gigaflop Milliard d'opérations en virgule flottante par seconde

GJ giga (10⁹) joule

GMT Greenwich Mean Time

GO GigaOctet

Gp Gain en puissance / Power gain

GPS Gallons Per Second

gr Grade

Gregorian calendar, new style calendar Calendrier grégorien / Calendario gregoriano

grt Gross Registered Tonnage (transports)

Gs Gauss One gauss =1 Maxwell / cm²

Gt Gigaton (1,000 millions tons) / Gigatonne (1 Gt = 1 milliard de tonnes)

GUM Guide for the expression of Uncertainty in Measurement / Guide pour l'expression de l'incertitude de mesure

GW GigaWatt

GW Gross Weight / Poids brut

GWh GigaWatt hour

Gy Gray (SI unit of absorbed dose, 1 gray = 1 joule / kg)