| Abbreviation | Definition |
|---|---|
| LLS | Localized Light Scatterer |
| LM | Leaky Mode |
| LM | Light Microscopy |
| LMB | Left Mouse Button |
| LMC | Least Material Condition |
| LMF | Learning Materials Filestore |
| LMMA | Laser Microprobe Mass Analysis |
| LMRE | Lorain Medina Rural Electric |
| LMRS | Land Mobile Radio System |
| LMTO | Linear Muffin-Tin Orbital |
| LN | Low Noise |
| LNA | Low Noise Amplifier |
| LNB | Low Noise Block |
| LNB | Low-Noise Block down converter |
| LNBF | Low Noise Block Feedhorn |
| LNC | Low Noise Converter |
| LNDC | Low-Noise Down-Converter |
| LNDF | Linear Natural Density Filter |
| LNF | Low Noise Feed |
| LO | Local Oscillator |