"Daito" is a term used to refer to a long sword in Japanese martial arts. The word "daito" translates to "big sword" in English. It is commonly used to distinguish the longer sword in a pair, such as the katana in a Daisho (pair of swords consisting of a katana and a wakizashi).

In the context of Japanese swordsmanship, "daito" generally refers to a sword with a blade length of around 60-80 centimeters (24-31 inches). It typically has a curved, single-edged blade, a circular or squared guard (tsuba), and is held with a two-handed grip.

The daito, particularly the katana, holds great significance in Japanese martial arts and culture. It was the primary weapon of the samurai, symbolizing their honor, skill, and social status. The katana was renowned for its sharpness, cutting ability, and its role as a soul of the samurai.

It's important to note that the term "daito" itself does not represent a specific sword type but rather refers to the general category of a long sword in Japanese martial arts. The specific design, construction, and characteristics of a daito can vary based on the time period, school of swordsmanship, or personal preferences of the swordsmith.

Today, the term "daito" is often used in the context of Japanese martial arts training to differentiate the long sword from other types of weapons or to specify the primary sword in a pair.