So I would say that semantically you are on the safe side, so to speak, as maybe the Unicode Consortium has spoken to mathematicians who told them that the dot can be-and which is being-redefined to meet the mathematician’s need. Interestingly, for the 2218 ∘ RING OPERATOR symbol, the annotation does just that: “= composite function”. (See the image prepared by Danie Els.) This can be done, from my point of view again, because the Unicode standard does not define this operator to represent any mathematical operation.
In my opinion, the annotation “= midpoint (in typography)” for the 00B7 MIDDLE DOT symbol speaks for itself and I think one could use it in typesetting poems, for example, to mark stanzas or as a substitute for the regular space. Although I agree that all of these “bullets” could theoretically look the same (and one wouldn’t need to care about this issue at all), the semantic background can-at least to some degree-be inferred by the: Since two of the four symbols, which are subject of the discussion, are placed in Unicode Blocks named “punctuation” (see below), I would advise against using them in mathematical context. As the Unicode project seeks to determine the semantics of the glyphs rather than their graphical representation, this question is quite interesting. Because it can be confused with a multiplication sign is is not used in scientific literature any more. Decimal marker The center dot as decimal marker is only found in very old books or non-scientific literature. Chemical formula I don't know much about chemical notation (ask Joseph Wright).
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