R.Sale, I think we agree that this wavy or nebuly line, as you prefer, represents the cosmic boundary, the limit of the universe. Beyond is the kingdom of God.
I don't think that wavy line has anything to do with the iconographic language of heraldry, but it's not worth discussing because it's secondary. The important point is that the Voynich has nothing to do with heraldry.
There may be some image with heraldic value. The clearest is the root of the You are not allowed to view links.
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Seeing this image one thinks of the heraldic emblem of the Holy Roman Emperors, which is consistent with the image of a female figure from the zodiacal section wearing an imperial crown. Signs that indicate something that seems obvious for other reasons: that the VM was made in some territory of the Holy Roman German Empire.
In the same way, some religious images are also seen in the book, but that does not mean that the VM has a religious meaning.
For me, the VM is simply a book on medieval astrological science, a science that of course had a lot in common with magic.