It was a trick question The correct answer is still YoYo. The YoYo was invented by/originally sold by the YoYo company. They only made the one self named toy. Duncan later came out with the same toy (capatalizing on the the success), and called it a YoYo since that is all people knew it by. YoYo Corp failed to sue in a timely manner (because they were getting recognition for every sale, not just their own). When Duncan started to beat them out, they then sued for trademark infringement, but lost, because it was deemed too late. Thus YoYo became not only the name of the manufacturer, but officially the name of the toy as well. Frisbee is a similar situation, there is no other "offical" name for the flying disc toy -chris <http://www.mythtech.net>