A Japanese sword is one of several types of traditionally made swords from Japan. There are many types of Japanese swords that differ by size, shape, field of application and method of manufacture. Some of the more commonly known types of Japanese swords are the katana, wakizashi, and tachi. The katana is a general term for the traditional sword with a curved blade longer than 60 cm (there is no upper length limit but generally they are shorter than 80 cm), worn with the edge upwards in the obi. Developed from the uchigatana and the sword of the samurai class of the Edo period (1600s to late 1800s). The wakizashi sword is generally between one and two shaku long (30 cm and 60 cm in modern measurement), predominantly made after 1600. Generally it is the short blade that accompanies a katana in the traditional samurai daisho pairing of swords, but may be worn by classes other than the samurai as a single blade. Finally, the tachi sword is generally longer and more curved than the katana, with curvature centered from the middle or towards the tang, and often including the tang. Tachi were worn suspended, with the edge downward. The tachi was in vogue before the 1400s. See "Japanese Sword". Wikipedia. Retrieved 2014-12-14.