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The term ‘drone’ in the context of unmanned aerial devices originated from the early use of remotely flown target aircraft for military training purposes.
The term was originally applied to male ants or bees that lack stingers and have a single function, mating with the queen bee.
Later, the military began using this phrase to refer to unmanned aircraft utilized for surveillance and reconnaissance tasks.
https://thisanswer.com/why-are-drones-called-drones/