| Acronym | Meaning |
 | AID | U.S. Agency For International Development |
| IUCN | International Union For The Conservation Of Nature And Natural Resources (World Conservation Union) |
| 4D | Four-dimensional (usually Three Spatial Plus One Temporal Dimension |
| ITEMS | Interactive Tactical Environment Management System |
| MEC | Maine Central Railroad (AAR Reporting Mark) - Manta |
| RPL | Reverse Polish Lisp |
| UBS | Unbundled Bitstream Services - United Bank Of Switzerland - United Banque Suisse |
| USAADAC | U.S. Army Air Defense Artillery Center |
| ABW | Aruba (ISO 3166 Trigram) |
| GM | The Gambia (ISO 3166 Digram) -GameMaster (role-playing) - General Motors - Genetically Modified -Germany (FIPS 10-4 Country Code) -Guru Meditation (computing) |
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