The OED said that the banned "hoverboards" certainly did not qualify. "The boards ridden by rapper Wiz Khalifa at Los Angeles airport recently (ridden, that is, until police wrestled him to the ground), and by a pilgrim performing the tawaf in Mecca are hoverboards in name only: the word is currently registered as a trademark in the US and the UK by manufacturers of a miniature, Segway-style, two-wheeled vehicle which stays firmly on the ground," the OED said.