IncludeFileExtension is an option for notebooks that specifies whether the suffix ".nb" is automatically appended to a notebook's name when it is first saved.
PrintAction is an option for notebooks that specifies the action taken when a Print[] command is evaluated by the kernel.
PrintingPageRange is an option for notebooks that specifies the range of pages of a notebook to be printed.
PrintingStartingPageNumber is an option for notebooks that specifies what number to assign to the first page of a notebook when printed.
RulerUnits is an option for notebooks that specifies the units in the ruler toolbar.
StartupSound is a global option that specifies whether Mathematica plays a sound when it is launched.
Unicode: 2223. Alias: Esc ␣| Esc. Infix operator. x y is by default interpreted as VerticalBar[x,y]. Used in mathematics to indicate that x divides y. Also sometimes called ...
"TemplateSelection" is a front end token that inserts a function template to the right of the insertion point.
BoxData
(Built-in Mathematica Symbol) BoxData[boxes] is a low-level representation of the contents of a typesetting cell.
CellDynamicExpression is an option for cells that specifies an expression to be dynamically updated whenever the cell is visible on-screen.