| Abbreviation | Definition |
|---|---|
| L-BAND | 1 GHz through 2 GHz |
| LBDT | Low Bay Dolly Tug |
| LBFD | Low-Boom Flight Demonstrator |
| LBK | Left BanK |
| LBL | Left Buttock Line |
| LBM | Load Buffer Memory |
| LBNPD | Lower Body Negative Pressure Device |
| LC | Launch Complex |
| LC | Launch Countdown |
| LC | Launch Critical |
| LC | Left Center |
| LCA | Launch Control Amplifier |
| LCA | Load Controller Assembly |
| LCB | Least Common Bit |
| LCC | Launch Commit Criteria |
| LCCD | Launch Commit Criteria Document |
| LCD | Launch CountDown |
| LCED | Life Cycle Engineering Design |
| LCF | Low Cycle Fatigue |
| LCG | Liquid Cooled Garment |