| Acronym | Meaning |
| C4I OR C?I | Command |
| EN | Corps Of Engineers -Estonia (FIPS 10-4 Country Code) - Exanewton |
| BAK | Bashkir Language (ISO 639-2 Code) |
| RTT | Round Trip Timing |
| GPC | Global Path Cache |
| VAO | Vienna Art Orchestra |
| EXFOR | Experimental Force (military) |
| FAB | Feline Advisory Bureau (UK Feline Charity) |
| ICRL | Individual Component Repair List |
| HIN | Hindi Language (ISO 639-2 Code) |