Depends on the context.

G=GEEK
G=GOD
G=In ECDSA, it's the BASE/GENERATOR POINT to generates a subgroup of large prime order n.
G=Gravitational constant ((6.673 ± 0.010)·10-11 m3/kg·s2)
G=Gibbs free energy
G=the letter ג (ghimel) caring

@2567 @7145 @292