ColumnSpacings is an option for the low-level function GridBox which specifies the spaces in ems that should be inserted between adjacent columns.
DefaultLabelStyle is a low-level option for formatting and related constructs that specifies the default style to use in displaying their label-like elements.
DeleteBorderComponents[image] replaces connected components adjacent to the border in a binary image image with background pixels.DeleteBorderComponents[m] replaces ...
DiacriticalPositioning is an option for UnderscriptBox and related boxes that specifies how close diacritical characters are drawn to the base character.
DirectoryName["name"] extracts the directory name from the specification for a file.
EnterExpressionPacket[expr] is a MathLink packet that requests the evaluation of expr.
FieldMasked is an option to InputField that determines whether to mask user input.
FileNameDepth["file"] gives the number of path elements in the file name " file".
FrameBox[box] is a low-level box construct which represents box with a frame drawn around it.
General
(Built-in Mathematica Symbol) General is a symbol to which general system messages are attached.