Dao sword
From Tardis Wiki, the free Doctor Who reference
Dao swords were Chinese swords with curved blades.
In 1807, the Thirteenth Doctor, Yasmin Khan, Dan Lewis, Zheng Yi Sao and Sin Ji-Hun used dao swords to fight the Sea Devils led by a chief. (TV: Legend of the Sea Devils)
Chinese magician Li H'sen Chang used a dao sword to threaten Mr Sin in his act at the Palace Theatre. (TV: The Talons of Weng-Chiang)