Kusanagi-no-Tsurugi is a legendary Japanese sword, often associated with the Shinto deity Susanoo. According to mythology, it was discovered in the tail of an eight-headed serpent called Yamata-no-Orochi and later became a symbol of the Japanese imperial family. The sword is one of the three sacred treasures of Japan, known as the Three Imperial Regalia, which also includes the Yasakani no Magatama and the Ame-no-Murakumo-no-Tsurugi. Kusanagi-no-Tsurugi represents valor and is often depicted in various forms of Japanese art and literature, highlighting its significance in the nation's cultural heritage.