Egregoros

I've decided I don't like the sonnenrad (black sun) because it's a symbol of death and decay. I'd prefer if my people didn't have to undergo any blackening at all.

I'm sceptical that's it's original meaning. The most ancient sun-wheels are just solar symbols.

Alchemists in the 18th/19th century were big into adding secret lore to their experiments and they borrowed all kinds of symbols to apply to them without really knowing what they meant.