Cycler

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A cycler is a potential spacecraft on a closed transfer orbit that would pass close to two celestial bodies at regular intervals. Cyclers could be used for carrying heavy supplies, life support and radiation shielding.
Free return trajectory.
A free-return trajectory is a symmetrical orbit past the moon and Earth that was first analysed by Arthur Schwaniger
Lunar cycler.
A "lunar cycler" or "Earth–Moon cycler" is a cycler orbit, or spacecraft therein, which periodically passes close by the Earth and the Moon, using gravity assists and occasional propellant-powered corrections to maintain its trajectories between the two. If the fuel required to reach a particular cycler orbit from both the Earth and the Moon is modest, and the travel time between the two along the cycler is reasonable, then having a spacecraft in the cycler can provide an efficient and regular method for space transportation.
Mars cycler.
A "Mars cycler" or "Earth–Mars cycler" is a spacecraft trajectory that encounters the Earth and Mars on a regular basis, or a spacecraft on such a trajectory
Interstellar cycler.
An "interstellar cycler" or "Schroeder cycler", a theoretical spacecraft trajectory that encounters two or more stars on a regular basis, or a spacecraft on such a trajectory