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An electric unicycle, often shortened to EUC, is the more technically correct and widely used term today. It describes a device with a single large wheel, footpads either side, and an internal gyroscope that keeps the rider upright by constantly adjusting motor output.
Some manufacturers also design the CPU_OPT header with slightly different current tolerances, particularly on boards aimed at enthusiasts who might connect a second pump or a splitter feeding multiple fans.