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

[oshfdk]

How about noting the numbers of things that are not divisible by 5 for a change? I bet there are 4 times as much.

I remember there was a list of suffixes somewhere with a "remarkably high number of counts divisible by 5". I checked, and this remarkably high number turned out to be ~16%. But then I started thinking about what the actual expected percentage should be (given that counts are not uniformly distributed and are skewed towards lower numbers, so 20% is probably not the right answer) and got distracted.