Unicode: F3CE. Alias: Esc hc Esc. Superscript postfix operator with built-in evaluation rules. m^ is by default interpreted as ConjugateTranspose[m]. Not the same as ...

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

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.

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 ...

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

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 ...

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

Unicode: F765. Alias: Esc , Esc. Structural element with built-in meaning. \[InvisibleComma] is by default not visible on display, but is interpreted on input as an ordinary ...

Unicode: F603. Alias: Esc l| Esc. Matchfix operator.  x  is by default interpreted as BracketingBar[x]. Used in mathematics to indicate absolute value (Abs), determinant ...

Unicode: F605. Alias: Esc l|| Esc. Matchfix operator.  x  is by default interpreted as DoubleBracketingBar[x]. Used in mathematics to indicate taking a norm. Sometimes used ...