A "compact" overview does not need 17 different currency symbols, mostly
inherited from the <http://kermitproject.org/utf8.html> sampler line.
Test only internationally significant valuta, guided by the top 28 listed
at <https://en.wikipedia.org/wiki/Currency?oldid=
942055810#cite_ref-10>,
keeping recent additions (₹, ₽) and adding a full-width character (元).