草那芸の大刀: Kusanagi no Tachi, the great sword found in the serpent's tail

これが草那芸の大刀くさなぎのたちで、のちに草薙剣くさなぎのつるぎと呼よばれる剣けんです。

This was the Kusanagi no Tachi, a sword later called Kusanagi no Tsurugi.