Historical Basis of the Chawan Sign

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In this post we take a look into historical roots of the Chawan Sign seen in Shenmue, as well as its mention in other media - notably the Kenji manga.

Does the Chawan Sign in Shenmue Have a Historical Basis?
https://www.phantomriverstone.com/2024/03/does-chawan-sign-in-shenmue-have.html