GTG
Gtg, GTG, gtg, or G2G may refer to:
Grantsburg Municipal Airport (IATA code)
Gauge theory gravity, a theory of gravitation
Geophysical Tomography Group, of the Institut de Physique du Globe de Paris
G2G Racing, an American stock car racing team
GTG, a codon in the DNA codon table for the amino acid valine
G2G, government-to-government, as in government-to-government contracting and in e-governance
Good to Go, electronic toll system in Washington state
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