This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
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 \[ImaginaryI] special form of i representing (entered as Esc ii Esc)
Special Letter-Based Forms
Variant Greek Letters
Dotless Letters
DotlessI \[DotlessI] dotless i, used for unit vectors with hats, etc.