| Acronym | Meaning |
 | NAC | National Agency Check - U.S. Naval Avionics Center - U.S. Navy Advanced Concepts - North Atlantic Council - Northern Area Command |
| QNH | Regional Mean Sea Level Atmospheric Pressure (aeronautical Q Code) |
| NSN | National Stock Number |
| OPINTEL | Operational Intelligence |
| CADPAT | CAnadian Disruptive PATtern |
| HPGL OR HP | GL -Hewlett-Packard Graphics Language |
| NHS | National Health Service (UK) |
| OAC | On Approved Credit |
| XIX | Nineteen (in Roman Numerals) |
| PZ | Panama Canal Zone (ISO 3166 Digram; Obsolete 1980) -Pickup Zone |
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