“The term micro-hub didn't have much to do with the size of the drones. It was nomenclature Hail's crew used to refer to a drone's heritage. The main drone was Foghat, which dropped off the hub called Led Zeppelin or its mini-drone. The next group of hubs that were released by Led Zeppelin was referred to as micro-hubs. If those hubs parented more hubs, then those would be called nano-hubs and so on until pico has been used. Hail's drone laboratories had never nested drones deeper than pico, so there was no need for any further classification. The inventors of the metric system in 18th century France, had little need for any terminology smaller than micro, because they didn't have instruments fine enough to measure more minute increments. But in later years, pico, femto, atto, zepto and yocto metric increments had been established in case Hail's team ever needed them.” DronesMetric SystemNesting Book:Operation Hail Storm Source: Operation Hail Storm