| Abbreviation | Definition |
|---|---|
| PTSC | Power Telephone Supply Company |
| PTSC | Public Transport Service Corporation |
| PTSC | Public Transportation Service Corporation |
| PTSC | Public Transportation Services Corporation |
| PTSI | P A M Transportation Services Inc |
| PTSI | Pharmaceutical Trade Services Inc |
| PTSI | Premier Tech Sales Inc |
| PTSI | ProActive Technology Solutions Inc |
| PTSI | Professional Transportation Services Inc |
| PTST | Pop Tarts Suck Toasted |
| PTT | Pacific Telephone Telegraph Company |
| PTT | Pacific Telephone & Telegraph Company |
| PTT | Philippine Telegraph and Telephone Company |
| PTT | Presentations That Talk |
| PTTA | Practical Technology Training Australia |
| PTTC | Public Transport Ticketing Corporation |
| PTTP | Pinnacle Titan Technology Partners |
| PTTP | Profit Through Technology Products |
| PTV | Parque Tecnológico Virtual, S. A. |
| PTV | Prime Television |