Origin of the Shield Shape in the Solar Folio of the f85-86 Foldout

[oshfdk]

If it takes more than just visual similarity, what more does it take?

I guess some meaningful context or a system that unites visually similar features. If a single item in the MS matches very well visually with something else, this is a good reason for investigation, but this is not a good reason to just claim that A is B, case solved.