Daisho refers to the paired swords, a long sword (daito) and a short sword (shoto), traditionally worn by samurai.
While the katana and wakizashi were most common, variations existed. Daisho became fashionable late in the Muromachi period and were mandated for official samurai duties.
Although samurai typically fought with only one sword at a time, dual-sword techniques also developed. Finally, specific display conventions exist, primarily focused on ensuring the maker's mark (mei) is visible.