Weapons in a martial art from Japan are known collectively as Buki.
Weapons defences are a key part of the art and allow a defender to deal with attacks using the traditional weapons of sticks, knives, chains and bokken/katana (swords). The art also deals with more modern offensive weapons such as bottles, baseball bats, pint glasses, broken bottles etc.
The core principles of early positive engagement, the breaking of the balance and central core really come into their own when dealing with weapons. Fancy, complicated twisting and turning has no place when dealing with a fast, realistic weapon attack and have no place in Junsui Ryu Ju Jitsu. Our responses are simple and effective, if sometimes not pretty!
The use of a weapon by an attacker grants them the advantage of distance and often increased power as a result of greater leverage. In addition, sharp weapons such as knives and broken bottles need only a little contact to cause major damage. A realistic approach to training grants the jitsuka an edge when dealing with these very nasty attacks whilst at the same time identifies the issues involved. Thus no jitsuka will come out of weapons training feeling they need not worry about an armed attacker; rather, the jitsuka develops a healthy respect for weapons and learns to deal with them quickly and efficiently.
Finally, Junsui Ryu Ju Jitsu teaches the Jo from Shodan and above. The Jo is a short staff of just over four foot in length. Training with the Jo emphasises the use of the body as a whole in order to wield the weapon, with the power coming from the feet, up through the hips. It is for this reason that that jo is not taught until after Shodan (Black Belt). The jo is taught as an extension of the body and is not simply a big stick to wave around.