| Abbreviation | Definition |
|---|---|
| GSP | Gold Standard Press |
| GSP | Gymna Stability Profile |
| GSS | German Stainless Steel |
| GSS | Grand Spaulding Special |
| GSTD | Gold Standard |
| GT | Glossy Top |
| GT | Graphite Tip |
| GT | Groove Tube |
| GTC | Gas Transportation Company |
| GTC | Grand Touring Coupe |
| GTE | Grand Tour Edition |
| GTM | Go-To-Market |
| GTR | General Tilt Roller |
| GTRB | Turbine Generator |
| GTSM | Gladwin Tensor Strain Meter |
| GTST | Goede Tijden Slechte Tijden |
| GU | General Use |
| GUAR | GUARanteed |
| GUC | Gently Used Condition |
| GUCCI | Giving Up Cheap Coochie Invitations |