The rondel dagger was an important weapon in the 14th-15th century AD, in Europe. It was a long, stiff thrusting weapon used in reverse grip (blade below hand). The disk shaped pommel and guard (the rondels) protected and stabilized the hand, and made the weapon difficult to take away. The weapon was used for powerful thrusts in the hammer fist manner, against chain mail, or the gaps in plate armor. Of course, if the opponent was not armored, the thing worked even better.
The rondel dagger was a very popular because it suited the times. Knights, soldiers and civilians alike carried it, and a certain amount of artistry developed in its use, hooking and trapping moves, as well as thrusts.
I have noticed that the Chinese invented many sorts of edged and pointed weapons, quite a variety, in fact, and more than Europeans. I am wondering if the extremely practical rondel dagger has any near matches among Chinese weapons. Thanks!
I define internal martial art as unusual muscle recruitment and leave it at that. If my definition is incomplete, at least it is correct so far as it goes.