What is a drone? Twenty years ago, the answer was easy. Ignoring the definitions having to do with insects, a drone was a term strictly used for a military autonomous flying vehicle. Drones were (mostly) used for target practice or for gathering intelligence (reconnaissance). Along came a company called Dragan that made one of the first commercially available quadrocopters (the DraganFlyer) and the term Quad Helicopter was born.
Their first commercially available multicopter was simply called the Quad Helicopter and came out in 1997 (it is shown in the following image):