A hoverboard is a well-known science fiction trope: a skateboard-sized device that can float above solid surfaces and is used for personal transportation and recreation.
Today there exist some modified Segway bases that call themselves hoverboards despite the fact that they are entirely incapable of hovering.
If anything, they are less capable of spending time aloft than a standard skateboard.
However, their name causes confusion among potential purchasers and may mislead us into obtaining one despite the lack of the advertised capability.
Worse yet, if they become popular and retain this name, they may poison the original term and make great science fiction works like Back to the Future less accessible to future generations.
For these reasons, the devices should not be allowed to advertise themselves as Hoverboards. Self-balancing boards or Headless Segways would be more reasonable.
I understand that Patmont Motor Werks has registered a trademark on the term hoverboard for two wheeled scooters; this is not the source of my objection.
Also, their trademark should be sharply limited to ensure that actual hoverboard manufacturers can call their products hoverboards without legal difficulty.