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The post says exactly this.


Ok, I missed this part from the article:

> according to the Unicode annotation, it is "a binding signature mark."

I still did not parse what that meant. It is a tad succinct, in that dry way you might expect from a description of Unicode codepoints.

Edit: then it says:

> Binding signature marks are marks placed by publishers on the edges of signatures (aka "gatherings" -- printed and folded sheets in units of 8, 12, 16, 24, or 32 pages) for book binding


It goes on to explain what that means, and also which signature marks are represented in Unicode




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