None
(Built-in Mathematica Symbol) None is a setting used for certain options.
NullRecords is an option for Read and related functions which specifies whether null records should be taken to exist between repeated record separators.
NumberPoint is an option for NumberForm and related functions which gives the string to use as a decimal point.
OutputStream["name", n] is an object that represents an output stream for functions such as Write.
PageFooters is an option for notebooks that specifies what should be inserted as the footer of each page of a notebook when it is printed.
PageHeaders is an option for notebooks that specifies what should be inserted as the header of each page of a notebook when it is printed.
ParentDirectory[] gives the parent of the current working directory. ParentDirectory["dir"] gives the parent of the directory dir.
Plus
(Built-in Mathematica Symbol) x + y + z represents a sum of terms.
PolarAxes is an option for sector charts and polar plots that specifies whether polar axes should be drawn.
QuartileSkewness[list] gives the coefficient of quartile skewness for the elements in list.QuartileSkewness[dist] gives the coefficient of quartile skewness for the symbolic ...