| Abbreviation | Definition |
|---|---|
| LPPT | Low Power Physics Test |
| LQE | Light Quantum Efficiency |
| LQP | Local Quantum Physics |
| LR | Lightning Rod |
| LRA | Locked Rotor Ampere |
| LRM | Line of Relative Motion |
| LRR | Laser RetroReflector |
| LRV | Light Refraction Value |
| LS | Linear Superposition |
| LSA | Limited Speed Arouser |
| LSBB | Laboratoire Souterrain à Bas Bruit |
| LSMP | Laboratory of Soft Matter Physics |
| LSOP | Little Shop Of Physics |
| LSP | Laser Stand Point |
| LSP | Lightest Supersymmetric Particle |
| LSS | Last Scattering Surface |
| LSS | Light Side Scatter |
| LST | Light Stabilizer Technology |
| LTA | Low temperature (oxygen plasma) ashing |
| LTFP | Laboratory for Theoretical Fundamental Physics |