المحول micro [μ] <—> nano [n] • المحولات المتنوعة • Metric ...
Length in Ancient Egypt was measured in cubits and then in royal cubits, a cubit being the length from the elbow to the tip of the extended middle royal cubit was thus the cubit but measured on the royal person, the pharaoh. A prototype was created based on this measurement, and it was publicly available, so that the people could create their own prototypes.