Hunting for a particular symbol today that doesn't seem to be in any font installed on my laptop, I stumbled upon the Wikipedia Miscellaneous Symbols page:
"Miscellaneous Symbols is a Unicode block (U+2600–U+26FF) containing glyphs representing concepts from a variety of categories, astrological, astronomical, chess, dice, musical notation, political symbols, recycling, religious symbols, trigrams, warning signs, and weather, among others."
These symbols can be cut-and-pasted into almost any (Unicode compliant) font in almost any application (under Linux anyway
A few examples:
? ? ? ? ?
I'm now going to find ? useful in French Car Wiki articles.