| Abbreviation | Definition |
|---|---|
| PE | Pacific Electro Dynamics |
| PEEO | Pressure Equipment Exemption Order |
| PESR | Pressure Equipment Safety Regulation |
| PH | Polyphase |
| PHCN | Power Holding Company of Nigeria |
| PI | Precision Instruments |
| PISC | Purchasing and Ingredient Suppliers Conference |
| PISC | Purchasing Ingredient Suppliers Conference |
| PL | Plessy |
| PN | Pyle National |
| PO | Piconics |
| PP | Parsons |
| PR | Power Physics |
| PSEB | Punjab State Electricity Board |
| PSPC | Public Services and Procurement Canada |
| PVS | Pro-Vet Supplier |
| QAFCO | Qatar Fertliser Company |
| RA | RCA Corporation |
| RC | RCA Corporation |
| RI | RF Interonics |