| Acronym | Meaning |
| PAYD | Pay As You Drive |
| YI | Yiddish Language (ISO 639-1 Code) |
| HK | Hong Kong (ISO 3166 Digram; FIPS 10-4 Territory Code) |
| RN | Royal Navy |
| MEM | Message Exchange Mechanism -Microelectromechanical |
| PBI | PolyBenzImidazole |
| PAHO | Pan American Health Organization |
| MLLW | Mean Lower Low Water (nautical Charts) |
| MA | Megaannum |
| QNH | Regional Mean Sea Level Atmospheric Pressure (aeronautical Q Code) |