The Hanzi meaning for 圭 guī = (old) jade tablet (a ceremonial badge of rank)
I checked the images, not sure based on what jade tablet 圭 is drawn, can any one point to the correct image? Thanks
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「圭」 does not come from a depiction of a tablet. That meaning of jade tablet is a semantic extension.
「圭」 (Baxter-Sagart OC: /*[k]ʷˤe/, jade implement) had two origins: A) the blade-head of a ceremonial jade dagger-axe 「戈」 (/*kʷˤaj/), and B) semantic 「士」 (bladed weapon > soldier) with simultaneously semantic and phonetic 「戈」.
Series A) doesn't survive in the modern writing system; for Series B), later on, 「士」 was doubled, and 「戈」 was omitted. The 「士」-shapes were eventually corrupted into 「土」, forming 「圭」.