| Abbreviation | Definition |
|---|---|
| PDL | Push Down List |
| PDWA | Pressure Differential Warning Assembly |
| PEA | Push Effective Absolute |
| PEA | Push Effective Address |
| PEF | Preferred Executable File |
| PEHC | Punch Extra Holes in Cards |
| PEI | Push Effective Index |
| PEI | Push Effective Indirect |
| PFF | Psychic Fun Froyo |
| PFN | Primitive Function Name |
| PGA | President of the General Assembly |
| PGA | Program Global Area |
| PI | Pages In |
| PI | Processing Instruction |
| PIC | Punch Invalid Character |
| PIPE | Practice In Programming Environment |
| PJ | Pointer Justification |
| PKE | Print Keymap Expression |
| PL | Program Line |
| PLT | Procedure Linkage Table |