| Acronym | Meaning |
 | REU | R?union (ISO 3166 Trigram) |
| VLBA | Very Long Baseline Array |
| BCC | Blind Carbon Copy |
| BND | Brunei Dollar (ISO 4217 Currency Code) |
| ADW | Air Defence Warning |
| PAPI | Precision Approach Path Indicator (aviation) |
| NUL | Null Character (ASCII Code Of Control Character) - National Urban League |
| NOAF | Norwegian Air Force |
| KI | Gikuyu Language (ISO 639-1 Code) |
| SIF | Selective Identification Feature |
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