it's called a katana when it's assembled in china (which is much more complicated then I can even start with)
I miss my numchucks so much. I broke them on a tree in the woods (on accident). The tree had called Mark a racial name...
depends, in concealed weapon situations a tessen is perfect, with the katana you need the full set, and frankly you can kill a lot more people a lot faster with swords then staves, tetsubo's were designed for law enforcement, the name means something like ten hands because the weight of it striking you (correctly wielded) is as though you are being hit ten times, a katana just kills you, it depends entirely on your application if you wish to kill a man who has much greater reach then you and you have no money a longship oar may be the best weapon (now if someone got that allusion I love you forever and ever)
the benefit of nanchaku is that a remarkably unskilled person can do a remarkable amount of damage, same as a morning star in western weaponry, just a morning star can fuck up armour pretty bad