This one is Chinese for sure.
Regarding the name - bijiacha in Chinese, no correspondence to Japanese in spite of the hyerogliphic as they used another tradition - some words in Chinese are written by different hyerogliphs then in Japanese and visa versa.
Regarding the police weapon - not for China. For Japan - it is OK.
The origin of the weapon could be from trishula trident in Buddhist iconocgarphy but this point is not for sure - only assumption.
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