| Abbreviation | Definition |
|---|---|
| EFCS | Electronic Flight Control System |
| EFCS | Electronic flight control systems |
| EFD | Electronic Filing Depository |
| EFD | Electronic Fiscal Device |
| EFD | Electronic Flight Display |
| EFDS | Electronic Fraud Detection System |
| EFDS | Electronic Fund Data Sheet |
| EFE | Energy From the Electrical |
| EFF | Electronic Frontier |
| EFF | Equalized Frequency Flow |
| EFFY | Electric Fantastic F*** You |
| EFG | Electric Field Gradient |
| EFG | Electronic Field Guide |
| EFHS | Electronic Framingham Heart Study |
| EFI | Electric Fuel Injection |
| EFI | electrical fuel injection |
| EFI | Electronic File Interchange |
| EFIE | Electric field integral equation |
| EFIE | Electric-Field Integral Equation |
| EFIE | Electronic Fuel Injection Enhancer |