| Acronym | Meaning |
 | RAF | Red Army Faction - Royal Air Force |
| AARP | (i/s) American Association Of Retired Persons (now Officially Known Only By The Initials) |
| UPN | United Paramount Network |
| HMM | Hidden Markov Model |
| RJD | Reduced Julian Day |
| MW | Maintenance Of Way (also MOW) -Malawi (ISO 3166 Digram) -Medium Wave (radio) -Megawatt |
| XHTML | EXtensible Hypertext Markup Language |
| HI | Hawaii (postal Symbol) |
| GH | Ghana (ISO 3166 Digram; FIPS 10-4 Country Code) - Gigahenry |
| IDR | Indonesian Rupiah (ISO 4217 Currency Code) |
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