| Abbreviation | Definition |
|---|---|
| FTL | Flash Transition Layer |
| FTM | Film Thickness Monitor |
| FTM | Frequency and Time Measurement |
| FTM | Frequency-Time Modulation |
| FTMC | Frequency and Time Measurement Counter |
| FTPL | Fourier Transform Photo Luminescence |
| FTTC | Fiber To The Curb |
| FTTD | Fiber-To-The-Desk |
| FTTH | Fiber To The Home |
| FTTW | Fiber To The Workplace |
| FU | Feedback Unit |
| FVD | Foreign Voltage Detector |
| FW | Filament Wound |
| FW | Fluctuating Wildly |
| FW | Frequency Weights |
| FW | Full Wave |
| FWHM | Full Width at Half Maximum |
| FWHP | Full Width at Half Peak |
| FWHP | Full Width at Half Power |
| FWL | Forward Working Limit |