| Acronym | Meaning |
| EIC | East India Company |
| BRN | Brunei (ISO 3166 Trigram) |
| RJD | Reduced Julian Day |
| ZC | Zettacoulomb |
| EBCDIC | Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD) |
| CDS | Chief Of The Defence Staff |
| IMPATT | IMPact Avalanche Transit Time Diode |
| NGA | National Geospatial-Intelligence Agency -Nigeria (ISO 3166 Trigram) |
| ACOBA | Advisory Committee On Business Appointments |
| BA | Barium |