nun·cha·ku 
(nən-chäk) or nun·chuck (nŭnchŭk′) or num·chuck (nŭm-)
(nən-chäk) or nun·chuck (nŭnchŭk′) or num·chuck (nŭm-)n. often nunchakus or nunchucks or numchucks
A pair of hardwood sticks joined by a chain or cord and used as a weapon.
[Okinawan Japanese, probably from Taiwanese neng-cak, a type of farm implement : neng, two, paired (akin to Mandarin liǎng, from Middle Chinese liaŋ´) + cak, chisel (akin to Mandarin záo, chisel, from Middle Chinese dzak).]