| Acronym | Meaning |
 | PNG | Papua New Guinea (ISO 3166 Trigram) -Portable Network Graphic |
| LBR | Liberia (ISO 3166 Trigram) |
| RH | Southern Rhodesia (ISO 3166 Digram; Obsolete 1980) |
| CS | Combat Support - Computer Scientist -Costa Rica (FIPS 10-4 Country Code) - Serbia And Montenegro (ISO 3166 Digram) |
| FAAN | Fellow Of The American Academy Of Nursing |
| CSK | Czechoslovakia (ISO 3166 Trigram; Obsolete Since 1993) |
| PNS | Pensacola |
| AMFR | Age-specific Marital Fertility Rate - Amplitude Modulation Following Response |
| RDD | Radiological Dispersion Device |
| DDN | U.S. Defense Data Network |
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