Unicode: 21CC. Alias: Esc equi Esc. Infix arrow-like operator. x ⇌ y is by default interpreted as Equilibrium[x,y]. Used in chemistry to represent a reversible reaction. ...

Unicode: 25A0. Alias: Esc fsq Esc. Letter-like form. Used as a dingbat. Not the same as \[SelectionPlaceholder].

Unicode: 03C2. Alias: Esc fs Esc. Greek letter. Used in written Greek when σ occurs at the end of a word. Not commonly used in technical notation. Not the same as \[Stigma].

Unicode: 02C7. Alias: Esc hck Esc. Letter-like form. Used primarily in an overscript position. Used as a diacritical mark in Eastern European languages. Sometimes used in ...

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: 301A. Alias: Esc [[ Esc. Compound operator with built-in evaluation rules. m〚i,j,… 〛 is by default interpreted as Part[m,i,j,…]. Sometimes used in mathematics to ...

Unicode: 205F. Alias: Esc ␣␣ ␣ Esc. Spacing character. Width: 4/18 em. Interpreted by default just like an ordinary \[RawSpace]. Sometimes used in output as a separator ...

Unicode: 00B5. Alias: Esc mi Esc. Letter-like form. Used as a prefix in units to denote 10^-6. Not the same as \[Mu].

Unicode: 00A0. Alias: Esc nbs Esc. Spacing character. Generates a space with the same width as \[RawSpace], but with no line break allowed to occur on either side of it.

Unicode: 002A. Raw operator. Equivalent to the ordinary ASCII character with code 42. In addition to one-dimensional uses, x^* is by default interpreted as SuperStar[x]. x^* ...