NASA Abbreviations and Acronyms

1. LPTTL
   Low Power Transistor-Transistor Logic
2. LPTTL
   Low-Pressure Transistor-Transistor Logic
3. LQR
   Linear Quadratic Regulator
4. LR
   Left Rudder
5. LR
   Locus of Radius
6. LR
   Lunar Rendezvous
7. LR
   Lunar Relay
8. LR
   Landing Radar
9. LR
   Launch Right
10. LR/LD
    Line Receiver/Line Driver
11. LRA
    Laser Retroreflector Array
12. LRB
    Liquid Rocket Booster
13. LRC
    Langley Research Center
14. LRCA
    Long-Range Combat Aircraft
15. LRD
    Launch Readiness Date
16. LRECL
    Logical Records of Fixed Length
17. LRES
    Liquid Rocket Engine Stability Program
18. LRF
    Liquid Rocket Fuel
19. LRIP
    Low-Rate Initial Production
20. LRO
    Lunar Reconnaissance Orbiter

Last updated: May 6, 2025 — Total entries: 14,020