Positive (Built-in Mathematica Symbol)

Positive[x] gives True if x is a positive number.

ShowCellTags (Built-in Mathematica Symbol)

ShowCellTags is an option for Cell that specifies whether to display tags for a cell.

StructuredSelection (Built-in Mathematica Symbol)

StructuredSelection is an option for Cell that specifies whether to allow only complete subexpressions in the cell to be selected interactively using the front end.

UnderBar (Built-in Mathematica Symbol)

UnderBar[expr] displays with a bar under expr.

White (Built-in Mathematica Symbol)

White represents the color white in graphics or style specifications.

Whitespace (Built-in Mathematica Symbol)

Whitespace represents a sequence of whitespace characters in StringExpression.

WordBoundary (Built-in Mathematica Symbol)

WordBoundary represents a boundary between words for purposes of matching in StringExpression.

WordSearch (Built-in Mathematica Symbol)

WordSearch is an option for Find and FindList that specifies whether the text searched for must appear as a word.

$CreationDate (Built-in Mathematica Symbol)

$CreationDate gives the date and time at which the particular release of the Mathematica kernel you are running was created.

$HomeDirectory (Built-in Mathematica Symbol)

$HomeDirectory gives your "home" directory.