Nunchaku or known more commonly to Americans as Nunchucks are a Japanese weapon originating in Okinawa.
Back in the olden days many farmers were forbidden to have weapons.
So one of the weapons to combat the northern Samurai was this.
Though it didn't have much popularity, because when you go up against solid steel, there's not much of a chance.
Nunchucks are however more popular today.
Also for video game controller nicknames.