Recently there have appeared several proposals for expanded character sets. In general, these differ in the following respects: the number of characters in the expanded set, the characters selected, card and/or tape code representation, and superscripting and subscripting techniques. Currently, it seems to be popular to talk in terms of establishing a “standard expanded character set.” In the opinion of the author, this will prove to be extremely difficult in practice and undesirable in theory. This does not mean, however, that there should be no attempt to achieve “minimal standard character subsets” for communication purposes and “universal languages.”
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