The Rope Dart is as exactly as it sounds. A long rope with a deadly dart on the end. In Medieval times, if you knew how to use a Rope Dart, you were treated with the highest respect.
Why? Because more people died trying to learn how to use them than people who actually mastered it. You use the rope as a means to control the dart, much like in Shanghai Noon when (Jackie Chan) is fighting the two guys behind the bar and he winds the rope around himself multiple times, making it so he can use the shoe horse as a weapon.
Just replace the horse shoe with a dart, a very sharp, deadly dart.
That really isn't the best example because it wasn't quite like that. But this at least gives you an idea.
*Disclaimer: I have done extensive research on each of these weapons. I am aware that there are many different versions of each of these weapons. I am not trying to spread false information. If you know and can prove any information wrong, please let me know and I will fix my errors. I have at least three references for all research on the weapons I will discuss through the challenge.