| Acronym | Meaning |
 | W3C | World Wide Web Consortium |
| SCM | Surface Contamination Module |
| DTED | Digital Terrain Elevation Data (dee-ted) |
| MHC | Major Histocompatibility Complex |
| C3 OR C? | Colorectal Cancer Condition - Command |
| CRI | Costa Rica (ISO 3166 Trigram) |
| ASIO | Australian Security Intelligence Organisation -Audio Stream Input Output |
| HAT | Highest Astronomical Tide (nautical Charts) -Hungarian Automated Telescope |
| SHF | Super High Frequency |
| NAMBLA | North American Man-Boy Love Association |
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