| Abbreviation | Definition |
|---|---|
| LENR | Low Energy Nuclear Reactions |
| LEP | Large Electron Positron collider |
| LEP | Large Electron-Positron collider |
| LEPP | Laboratory for Elementary-Particle Physics |
| LET | Linear Energy Transfer |
| LeTID | Light and elevated Temperature Induced Degradation |
| LF | Latency Factor |
| LF | Light Fine |
| LF | Low Friction |
| LFAE | Ligand Field Activation Energy |
| LFAJ | Liquid Film Assisted Joining |
| LFAM | Line Focus Acoustic Microscope |
| LFAM | Line Focus Acoustic Microscopy |
| LFEO | Low Frequency Electromagnetic Oscillation |
| LFP | Local Field Potential |
| LFT | Leaving Fluid Temperature |
| LFTR | Liquid Fluoride Thorium Reactor |
| LFTS | Laboratorio de Física Teórica de Sólidos |
| LGA | Lattice Gas Automaton |
| LGG | Least General Generalization |