The popular toy, the yoyo, was invented by 16th century hunters in the Philippines.
Some claim that 16th century hunters in the Philippines had a yo-yo-like weapon consisting of large disks connected by a twine. The hunter hid in a tree and flung the disk at his prey, somewhat in the manner of slingshot, I suppose. The twine could be used to pull back the disks if his aim was off. It is also possible that the twine ensnared the animal's legs and tripped it so it could be killed more easily.
So there is some argument that the toy in the Philippines originated as a weapon, but no hard evidence. The most likely scenario is that the little round toy on a string made its way from ancient China to both Greece and the Philippines.
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