DefaultNaturalLanguage is an option for character selections that specifies the language used when checking the spelling of a word in a human natural language selection.
Delimiter represents a delimiter to be displayed in objects such as PopupMenu and Manipulate.
DirectoryStack[] gives the directory stack that represents the sequence of current directories used.
Environment["var"] gives the value of an operating system environment variable.
FieldHint is an option for InputField that specifies contents to display when the input field is empty.
FilePrint["file"] prints out the raw textual contents of file.
Full
(Built-in Mathematica Symbol) Full is a setting used for certain options, typically indicating that a full range of values should be included.
GraphDiameter[g] gives the maximum eccentricity of the vertices in the graph g.
ImageScaled[{x, y}] gives the position of a graphical object in terms of coordinates scaled to run from 0 to 1 across the whole image region in each direction. ...
LayerSizeFunction is an option for TreePlot that gives a function to specify the relative height to allow for each layer.