くないKunai is a small weapon used by Japanese ninjas, exquisitely handmade

Suffering without, or suffering, is a small weapon often used by Japanese ninjas. It is shaped like a dagger or Emei thorn, mostly made of iron. It is short in size and easy to carry and hide. https://live.staticflickr.com/65535/49313162808_9dc1b91ecb_z.jpg The reason why Ninjas are often chosen as portable weapons is that Suffering was originally a tool, which was equivalent to a modern multi-purpose knife or multi-purpose tool set in the market at that time, and no one would doubt it even if it was found on the go. Japanese is "く な い", which is written in the Chinese characters "「 内 "or" 苦 无 "according to the pronunciation. The latter is more commonly used. The conventional bitter system is about 10 to 15 cm long. Originally, bitterness was not only used for digging purposes, but also many people used the wall to cut the wall when climbing mountains. Later, it became a common protective weapon for ninjas who often need to dive. https://live.staticflickr.com/65535/49313862212_d86269f96c_z.jpg In addition, there is a smaller type of bitterness. The usage is similar to a shuriken flying prop, called ｢飞 苦 无｣ (と び く な い), which is essentially a lightweight version of darts. Because of its sharp shape, it can't throw with the rotating force like a shuriken, so it is more difficult to hit, and most ninjas who use flying pains have superb throwing skills. https://live.staticflickr.com/65535/49313865962_27e4fa412a_z.jpg