Fred asks: << how does one establish the name of a given typographical symbol? E.g. "obelus" refers to a dagger sign ---- but if I didn't already know that, how could I find out?

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Many dictionaries (in the U.S., at least) have a section titled something like Signs and Symbols, where one can look that kind of thing up. (Probably an excellent example would be Merriam-Webster's Third New International Unabridged Dictionary, though many abridged dicts. have rather adequate such lists.) It would be nice if there were such a thing on the web. (A quick check of Wikipedia suggests there is not much on the subject in that resource.) --Dan