| Abbreviation | Definition |
|---|---|
| LTL | Linear Temporal Logic |
| LTP | Low Temperature Physics |
| LTTR | Long-Term Thermal Resistance |
| LTW | Linearly Transformed Wave |
| LUKE | Life Under Kinetic Evolution |
| LUX | large underground xenon dark-matter experiment |
| LVDT | Linear Variable Differential Transformer |
| LVE | Light Vibrational Energy |
| LVL | Level |
| LVR | Lever |
| LVSEM | Low-Voltage Scanning Electron Microscopy |
| LWC | Large Water Cherenkov |
| LWGR | Light-Water-cooled, Graphite-moderated Reactor |
| LWR | Light Water Reactor |
| LZT | Laser Zone Texturing |
| LZT | Lead Zirconate Titanate |
| M | Magic |
| M | Mass |
| M | Multiple |
| m3/H | Cubic Meters per Hour |