Terms & Abbreviations: L
Lunar Module Guidance Computer.
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.”
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
Lunar optical rendezvous system.
Landing Point Designator. A set of marks on the LM window that helped the crew locate the designated landing area.