| Acronym | Meaning |
 | MHWN | Mean High Water Neaps (nautical Charts) |
| HBCD | HexaBromoCycloDodecane |
| ADC | Aide De Camp - U.S. Air Defense Command (1946-1992) - Apple Display Connector - Program Against Digital Counterfeiting Of Currency |
| FSTC | Foreign Science Technology Center (now NGIC) |
| GWAS | Grand Western Archery Society |
| MDL | Moldovan Leu (ISO 4217 Currency Code) |
| DQ | Dairy Queen -Jarvis Island (FIPS 10-4 Country Code) |
| IBA | Important Bird Area |
| ZHO | Chinese Language (ISO 639-2 Code) |
| SADD | Students Against Drunk Driving (national School Related Group) |
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