| Abbreviation | Definition |
|---|---|
| PSDS | Postal Source Data System |
| PSFR | Postal System Financial Report |
| PSM | Parcel Sorting Machine |
| PSO | Procurement Service Office |
| PSS | Postal Service Schedule |
| PSSR | Postal System Sales Report |
| PST&DI | Postal Service Training and Development Institute |
| PT | Portugal |
| PTGE | Portage |
| PTT | Post, Telephone, and Telegraph |
| PVDS | Plant-Verified Drop Shipment |
| PVI | Postage Validation Imprinter |
| PVS | Postal Vehicle Service |
| PW | Palau |
| PY | Paraguay |
| QA | Qatar |
| QA | Quality Assurance |
| QC | Quality Control |
| QC | Québec |
| QSI | Quality Step Increase |