Terms & Abbreviations: L

LEM

See LM

LGC

Lunar Module Guidance Computer.

LM

Lunar Module. Earlier it was known as the Lunar Excursion Module and abbreviated “LEM.” Even after the name change, it continued to be pronounced “lem.”

LMP

Lunar Module Mission Programer. A sort of autopilot for operating the LM when it was unmanned. In the end, an LMP was only ever used on Apollo 5. See Apollo experience report: Guidance and control systems; lunar module mission programer

LORS

Lunar optical rendezvous system.

LPD

Landing Point Designator. A set of marks on the LM window that helped the crew locate the designated landing area.