It's a weapon from Chinese novel and "玄重尺" is the weapon name in Chinese. It is actually a kind of Blunt weapon with Sword hilt, it is called "ruler" just because the shape.
The meaning of "玄"(xuan) is “black ”. 重(zhong) mean heavy, And the one of 尺(ruler)'s meanings is a kind of chinese classical weapon, like a heavy twohanded sword.
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It is actually a kind of Blunt weapon with Sword hilt, it is called "ruler" just because the shape.