Yo-yo - Wikipedia
7 days ago · A yo-yo (also spelled yoyo) is a toy consisting of an axle connected to two disks, and a string looped around the axle.It has some similarities to a slender spool.. A yo-yo is played by holding the free end of the string known as the handle (by inserting one finger—usually the middle or index finger—into a slip knot) allowing gravity (or ...