Diabolo

The diabolo (diːˈæbəloʊ ; commonly misspelled diablo) is a juggling or circus prop consisting of an axle () and two cups (hourglass/egg timer shaped) or discs derived from the Chinese yo-yo. This object is spun using a string attached to two hand sticks ("batons" or "wands"). A large variety, possibly, "hundreds," of tricks are possible with the diabolo, including tosses, and various types of interaction with the sticks, string, and various parts of the user's body. Multiple diabolos can be spun on a single string. Like the Western yo-yo, it maintains its spinning motion through a rotating effect based on conservation of angular momentum.