| Abbreviation | Definition |
|---|---|
| PSSI | Public Safety Services Inc |
| PSSI | Public Safety Systems Incorporated |
| PSST | Python Snippet Support Team |
| PSTCL | Punjab State Transmission Corporation Limited |
| PSTI | Per Se Technologies, Incorporated |
| PSTL | Pyramid Saimira Theatre Ltd |
| PSV | Philips Sport Vereniging |
| PSVW | Philip Staley Vineyards & Winery |
| PSW | ProSoundWeb.com |
| PSW | Pseudo Sound Works |
| PSWC | Punjab State Warehousing Corporation |
| PSZ | Performance Software Zone |
| PT | Panorama Tools |
| PT | Perseroan Terbatas Limited Company |
| PT | Polymicro Technologies |
| PTA | Paper Trade Associates |
| PTAG | Property Tax Advisory Group Inc |
| PTC | Parametric Technology Corporation |
| PTC | Parapsychic Talents Center |
| PTC | Philadelphia Transportation Company |