ChartElementFunction is an option for charting functions such as BarChart that gives a function to use to generate the primitives for rendering each chart element.
CounterAssignments is an option for selections that sets the value of a specified counter.
CounterIncrements is an option for selections that specifies whether the value of a specified counter is incremented by one.
CounterStyleMenuListing is an option for cells that specifies what counter styles are listed in the Counter popup menu of the Create Automatic Numbering Object dialog box.
DefaultNewInlineCellStyle is an option for cells that specifies the default style to use for new inline cells created in the notebook.
DeletionWarning is an option for InterpretationBox or TagBox objects that specifies whether a warning is issued if the box is deleted.
Directory[] gives the current working directory.
DoubleLeftArrow[x, y, ...] displays as x \[DoubleLeftArrow] y \[DoubleLeftArrow] ....
DoubleVerticalBar[x, y, ...] displays as x \[DoubleVerticalBar] y \[DoubleVerticalBar] ....
ErrorBox[boxes] is a low-level box construct that represents boxes that cannot be interpreted in input or output.