bone and shell

[Payal]

The original pictographs called 'gab-gol' (bone and shell) or 'bok-sa' in
Korean were certainly invented during the Yin dynasty (or Shang state, BC
1600~BC 1046), although it is uncertain who was the inventor. There is no
dispute regarding this matter between Korean and Chinese historians. There
are ample recent evidences that the dominant people of the Yin dynasty was
Korean, which some Chinese historians also acknowledge.
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[paulfinn31]

I didn't know this until now. Thanks for the info.