Representation of the indicator for special character aliases in Mathematica.
\[AliasIndicator] is an inactive letter-like form, used in describing how to type aliases.
An active character of the same appearance is typically obtained by typing Escape.
See The Mathematica Book: Section 3.10.5.
See also: \[EscapeKey] , \[SpaceIndicator] , \[ReturnIndicator] .