Okinawa". It generally refers to the classical weapon traditions of Okinawan martial arts , most notably the rokushakubo (six foot staff, known as the "bō"), sai (short unsharpened dagger), tonfa (handled club), kama (sickle), and nunchaku (chained sticks), but also the tekko (knuckledusters), tinbe-rochin (shield and spear), and surujin (weighted chain).