They have something in India called urumi which is a sword with a thin flexible blade like a whip. You wear it like a belt when you're not using it. It's very dangerous to learn though because you have to know how to use whips as well as swords. Sometimes people make whip swords as well where the sword separates into sections on a cord or wire but they're hard to make and not very practical and mostly people just want them because they look cool, not to actually use them.