Unicode: F816. Alias: Esc $w Esc. Letter-like form. Used to represent a formal parameter that will never be assigned a value.
Unicode: F817. Alias: Esc $x Esc. Letter-like form. Used to represent a formal parameter that will never be assigned a value.
Unicode: F818. Alias: Esc $y Esc. Letter-like form. Used to represent a formal parameter that will never be assigned a value.
Unicode: F819. Alias: Esc $z Esc. Letter-like form. Used to represent a formal parameter that will never be assigned a value.
Unicode: F754. Aliases: Esc _ Esc, Esc ls Esc. Letter-like form. Used to separate words visually, but treated as a letter for purposes of Mathematica input.
Unicode: 001B. Raw element. Equivalent to the non-printable ASCII character with code 27. Used in entering aliases for special characters in Mathematica.
Unicode: 2240. Infix operator. x ≀ y is by default interpreted as VerticalTilde[x,y]. Used in mathematics to mean wreath product.
"ExplainColoringDialog" is a front end token that brings up the Why the Coloring? dialog with an explanation of the syntax coloring in the selection.
"FixCellHeight" is a front end token that assigns a CellSize option to selected cells to fix their height at their current height.
"GraphicsRender" is a front end token that rerenders the selected graphics.