| Abbreviation | Definition |
|---|---|
| FEDEM | Finite Element Dynamics in Elastic Mechanisms |
| FEGT | Furnace Exit Gas Temperature |
| FES | First Excited State |
| FESEM | Field Emission Scanning Electron Microscope |
| FET | field-effect transistor |
| FF | Fission Fragments |
| FF | Forward Facing |
| FFAG | Fixed Field Alternating Gradient |
| FFAH | Filament-Filled Annular Helical |
| FFAI | Field-Free Associative Ionization |
| FFE | Far Field Extension |
| FFF | Field Flow Fractionation |
| FFP | Field-Free Point |
| FFR | fractional flow reserve |
| FFTW | Fastest Fourier Transform in the West |
| FH | Fermi Hole |
| FH | Finite Height |
| FHM | Fast Harmonic Method |
| FHP | Forum on the History of Physics |
| FIAP | Forum on Industrial and Applied Physics |