| Acronym | Meaning |
 | PID | Pelvic Inflammatory Disease -Plan Identification Number - Positive Identification - Procedural Identification -Procurement Identification Description |
| PJ | Petajoule |
| N/A | Not Available/applicable |
| MU | Mauritius (ISO 3166 Digram) - Oman (FIPS 10-4 Country Code; From Muscat) |
| VDMOS | Vertical Double-diffused MOS Transistor (vee-dee-moss) |
| HIH | His (or Her) Imperial Highness |
| VMF | Variable Message Format |
| AIRS | Aerometric Information Retrieval System (obsolete; Replaced With AFS) |
| PUS | Pashto Language (ISO 639-2 Code) |
| SIA | Singapore Airlines (ICAO Code) |
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