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Variant Letters
In catering to the fine points of mathematical typesetting and notational clarity, Mathematica provides a variety of special variant forms of letters.
Mathematica Notation and Doubled Letters
\[ImaginaryI] special form of i representing (entered as Esc ii Esc)
    
Special Letter-Based Forms
    
Variant Greek Letters
    
Dotless Letters
\[DotlessI] dotless i, used for unit vectors with hats, etc.
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