RRA stands for "Ride Reset Assist"
With many older attraction control systems when and attraction is powered down it can only be powered up with all of its parts in their "home" position. For instance at the Universe of Energy the ride computer can only start up the ride if all of the 12 vehicles are properly parked on the two turntables in the two cheaters. This is because the ride systems has to be sure it starts from a clean state where it can be certain it knows where all of its elements are located.
RRA allows the RCS (Ride Control System) and VCS (Vertical Control System) to start up using the last known locations of all of the ride system elements. This allows the operators to skip a lot of the normal power up procedures which can take up to 15 minutes to accomplish, and instead power the ride back up in only two minutes or so.