Yoyo is a toy consisting of an axle connected to two disks, and a string looped around the axle.

Yoyo or yo-yo is considered the second oldest toy in history, the oldest being the doll.

It is believed that the yo-yo most likely originated in China. The first historical mention of the yo-yo, however, was from Greece in the year 500 B.C. These ancient toys were made out of wood, metal, or painted terra cotta disks and called just that, a disc.