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Many stations in the system produce gravity by spinning the stations around an axis. This creates a centrifugal force perceived as artificial gravity for the people living on the station.
When moving in a spinning system the centrifugal force is no homogeneous, causing a coriolis force rectangular to the direction of movement. The effect is larger in smaller stations. In the books the coriolis force is described and irritating to people living on stations.
Belters commonly use the spin directions of a station as a system of direction of references. E.g. "Walk spinward."