| Acronym | Meaning |
 | DK | Denmark (ISO 3166 Digram) |
| HEMP | High-Altitude Electromagnetic Pulse |
| OC | Observer/Controller |
| MIDS | Multi-Function Information Distribution System |
| DB | Database - Deutsche Bahn |
| BTU | British Thermal Unit |
| NOMBO | Non-mine |
| GDP | General Dental Practitioner (UK) - Gross Domestic Product |
| SSN | Nuclear-Powered Attack Submarine (US Navy Hull Classification) -SIM Serial Number - Social Security Number - Socialist Solidarity Network - Subsystem Number (SCCP |
| ND | Non-Disclosure -North Dakota (postal Symbol) |
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