Grandmaster Benko teaches the Korean tahn do li ga.
There are two common names for the
nunchaku in Korean, "ee chul bong" (two-section stick), and
the more appropriate name, "tahn do li ga" (short flail).
Nunchaku is the Japanese word for tahn do li ga.
The tahn do li ga was a farm tool used for threshing grain. Rice
stalks were picked or cut, then were stacked in piles to dry. Once dried
the tahn do li ga was used, with a flipping
motion to strike the stalks, loosening the grains
which would fall and be collected for processing.