Gear ramp-
Basically its a ramp but its on a gear so it only moves balls the way the associated gear bit(s) are pointing
Gear-over-
basically its a gear with a slightly smaller base that you put over a crossover or reflector part to keep gear transmission over the crossover or reflector instead of building around it and being unable to use the unnecessary gear space for other parts when you could just put a gear-over on the crossover and your problem would be solved (or a gear system using a system similar to the lever)