"samurai" sword is politically incorrect. a true samurai sword is a sword that belonged to a samurai, or was made by a swordmaker who made swords for samurai. modern katanas and wakizashis do not employ the use of nanobubbles found in true samurai swords, an ancient technique now lost to the ages and one that has never been replicated, a technique that made most samurai swords almost "unbreakable" and certainly much stronger than modern swords.
^yes, i wrote that myself, no copy/paste here.
and that's badass.