Tsurugi (sword)
A tsurugi (剣) is a Japanese sword, akin to the Chinese jian. The word is used in the West to refer to a specific type of Japanese straight, double-edged sword used in antiquity (as opposed to curved, single-edged swords such as the katana).[1]

A tsurugi double-edged straight sword from the Kofun period (5th century)
Kusanagi-no-Tsurugi
The current name for the sword which is one of the Three Imperial Regalia of Japan is "Kusanagi-no-Tsurugi".
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