| Acronym | Definition |
|---|
| EFNI➣Europejskie Forum Nowych Idei (Polish: European Forum for New Ideas) |
| EFNI➣Engin Flottant Non Identifié (French: Unidentified Floating Craft) |
| EFNI➣Earth Force Naval Intelligence (Babylon 5 role-playing) |
| EFNI➣Eosinophilic Fibrillary Neuronal Inclusions |