Woah, looking at mdmilosz's chart, I realized a few of the symbols look roughly like the English letters they represent. Tin, for example, the spike and the dot resembles an "i" and turn it sideways and there's an "e". Granted, they don't all do that and some are a real stretch, but I think it's interesting. Gold and electrum, as another example, gold has two spikes and electrum has one. m and n have one and two curves, respectively.