\[IHat] (Mathematica Character Name)

Unicode: 00EE. Alias: Esc i^ Esc. Letter. Included in ISO Latin-1.

\[ImaginaryI] (Mathematica Character Name)

Unicode: F74E. Alias: Esc ii Esc. Letter-like form with built-in value.  is interpreted by default as the symbol I, representing Sqrt[-1].

\[ImaginaryJ] (Mathematica Character Name)

Unicode: F74F. Alias: Esc jj Esc. Letter-like form with built-in value.  is interpreted by default as the symbol I, representing Sqrt[-1]. Used in electrical engineering.

\[ImplicitPlus] (Mathematica Character Name)

Unicode: F39E. Alias: Esc + Esc. Infix operator with built-in evaluation rules. Used in entering mixed fractions. x Esc + Esc y is interpreted as x+y, but Esc + Esc has ...

\[Implies] (Mathematica Character Name)

Unicode: F523. Alias: Esc => Esc. Infix operator with built-in evaluation rules. x  y is by default interpreted as Implies[x,y]. x  y  z groups as x  (y  z). Not the ...

\[IndentingNewLine] (Mathematica Character Name)

Unicode: F3A3. Alias: Esc nl Esc. Raw operator. Forces a line break in an expression, maintaining the correct indenting level based on the environment of the line break.

\[Infinity] (Mathematica Character Name)

Unicode: 221E. Alias: Esc inf Esc. Letter-like form with built-in value. ∞ is interpreted by default as the symbol Infinity.

\[Integral] (Mathematica Character Name)

Unicode: 222B. Alias: Esc int Esc. Compound operator with built-in evaluation rules. ∫ f  x is by default interpreted as Integrate[f,x]. ∫_a^b f  x is by default ...

\[Intersection] (Mathematica Character Name)

Unicode: 22C2. Alias: Esc inter Esc. Infix operator with built-in evaluation rules. x ⋂ y is by default interpreted as Intersection[x,y]. The character ⋂ is sometimes called ...

\[InvisibleApplication] (Mathematica Character Name)

Unicode: F76D. Alias: Esc @ Esc. Structural element with built-in meaning. \[InvisibleApplication] is by default not visible on display, but is interpreted as function ...