I think op was referring to: https://en.wikipedia.org/wiki/Hook_sword https://en.wikipedia.org/wiki/Hook_sword https://www.mandarinmansion.com/item/chinese-ho

I think op was referring to: https://en.wikipedia.org/wiki/Hook_sword https://en.wikipedia.org/wiki/Hook_sword https://www.mandarinmansion.com/item/chinese-hook-sword https://www.mandarinmansion.com/item/chinese-hook-sword There's a fun fight with it in Crouching Tiger.