Noun
(space science) Initialism of low lunar orbit.
(semiconductor physics) Initialism of laser lift-off.
Source: en.wiktionary.orgAn orbital transfer vehicle (OTV)—essentially a "space tug"—powered by a single VF-200 engine would be capable of transporting about 7 metric tons of cargo from low Earth orbit (LEO) to low Lunar orbit (LLO) with about a six-month transit time. Source: Internet
NASA envisions delivering about 34 metric tons of useful cargo to LLO in a single flight with a chemically propelled vehicle. Source: Internet
In later years, through a study of many lunar orbiting satellites, scientists came to discover that most low lunar orbits (LLO) are unstable. Source: Internet