| Acronym | Meaning |
 | HMD | Heard And McDonald Islands (ISO 3166 Trigram) |
| GANGY | Green Anorak |
| DS | Darmstadtium |
| 4D | Four-dimensional (usually Three Spatial Plus One Temporal Dimension |
| BCC | Blind Carbon Copy |
| NAACP | National Association For The Advancement Of Colored People (N Double-A CP) |
| SU | Soviet Union (ISO 3166 Digram; Obsolete 1992) - Sudan (FIPS 10-4 Country Code) |
| DCAS | Devon And Cornwall Archery Society |
| AVUM | Aviation Unit Maintenanc |
| OSS | Office Of Strategic Services (1942?1945 |
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