1. This comes from Mathematica (IIRC) and is not otherwise standardized, but there may be some disambiguation benefit in using the double-struck italic letters from Unicode’s Letterlike Symbols block: U+2148 ⅈ and U+2149 ⅉ.

    At the very least, I’ve found it useful to use those characters in my source code (via \newunicodechar) in case house standards require upright roman, or bold, or whatever formatting.

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