"AboutBoxDialog" is a front end token that opens a notebook containing information about Mathematica.

"Above" is a front end token that creates an OverscriptBox and fills the base with a selection.

"BackgroundDialog" is a front end token that opens the Color dialog to set the background color for selected cells or text.

"Balance" is a front end token that expands the selection to cover the nearest pair of matched bracketing characters.

"Below" is a front end token that creates an UnderscriptBox and fills the base with a selection.

"CellContextDialog" is a front end token that opens the Cell Context dialog.

"CellLabelsToTags" is a front end token that gives a selected cell a cell tag that is the same as its current input or output prompt.

"CellMerge" is a front end token that merges the selected cells into one cell.

"CellTagsEditDialog" is a front end token that opens the Edit Cell Tags dialog.

"CellUngroup" is a front end token that ungroups selected cells.