| Abbreviation | Definition |
|---|---|
| PIO | Parallel Input Output |
| PIO | Port Input Output |
| PIO | Port Installed Options |
| PIO | Programmed Input Output |
| PIOCS | Physical Input/Output Control System |
| PIP | Programmable In Put |
| PIP | Programmable Input Processor |
| PIPE | Primary Integrated Platform Environment |
| PIPS | Parallel Information Processing System |
| PITS | Persistent Information Technology System |
| PJA | Pure Java Awt |
| PJM | Project Resource Management |
| PJR | Project Resource |
| PJS | Processing.js |
| PK | Property Key |
| PKS | Process Knowledge System |
| PL | Page Length |
| PL | Power Loss |
| PL | Procedure Library |
| PL | Program Location |