| Acronym | Meaning |
 | 4D | Four-dimensional (usually Three Spatial Plus One Temporal Dimension |
| WH | Wehrmacht Heer (German WW2 Army Vehicle Licence Plate Code) |
| NSA | U.S. National Security Agency - Naval Support Activity - No Strings Attached |
| DY | Dahomey (ISO 3166 Digram; Obsolete Since 1977) |
| ASIO | Australian Security Intelligence Organisation -Audio Stream Input Output |
| RH | Rhodium |
| EFT | Electronic Fund Transfer |
| DNAW | Day Night All Weather |
| YL | Yoctolitre |
| DMCA | Digital Millennium Copyright Act |
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