Kunai is a versatile tool originating from Japan, often associated with ninjas and Japanese martial arts. Originally used as agricultural tools for digging, cutting, or uprooting plants, kunai were later adapted for use as weapons in battle. Kunai have a simple design, with a straight or slightly curved blade, and a handle that can be held comfortably. They are often equipped with a ring at the end of the handle for ease of use and transport. Kunai can be used for attack, self-defense, or even as an aid in activities such as climbing. However, in popular culture, the use of kunai is often associated with ninja characters and other Japanese fictional characters.