ArrayPad[array, m] gives an array with m 0s of padding on every side. ArrayPad[array, m, padding] uses the specified padding.ArrayPad[array, {m, n}, ...] pads with m elements ...
AutoOpenNotebooks is a global option that specifies which notebooks should be automatically opened when Mathematica is started.
Back
(Built-in Mathematica Symbol) Back is a symbol that represents the back of a graphic for purposes of placement and alignment.
BeginDialogPacket[integer] is a MathLink packet that indicates the start of the Dialog subsession referenced by integer.
BoxFormFormatTypes is a global option that specifies the list of typeset format types that are currently defined.
CellContext is an option for Cell which specifies the context to use for the evaluation of the contents of the cell.
CellGroupingRules is an option for cells that specifies the rules used for grouping a cell.
ChartStyle is an option for charting functions that specifies styles in which chart elements should be drawn.
Commonest[list] gives a list of the elements that are the most common in list.Commonest[list, n] gives a list of the n most common elements in list.
Context
(Built-in Mathematica Symbol) Context[] gives the current context. Context[symbol] gives the context in which a symbol appears.