Comment by thaumasiotes

> I mean it's basically identical to a signature in terms of identification value, and, by the sounds of it, usage.I mean it's basically identical to a signature in terms of identification value, and, by the sounds of it, usage.

Usage, sure. It's a lot worse in terms of identification value; signatures can be forged, but signing seals look identical to each other by design. Nobody is going to produce an exact replica of your signature by accident, but with seals that's routine.

Or, in the words of my friend, 橡皮章的大小，字体都一样的 [rubber seals' size and font are all the same].

(I had asked her whether she had a seal herself. She confirmed that she has one, and sent me an image very similar to this: https://img1.baidu.com/it/u=3145542370,421755251&fm=253&fmt=... . But she noted that Chinese personal seals are more likely to be square than round.)