DialogSymbols is an option for Dialog which gives a list of symbols whose values should be localized in the dialog.
SelectionEvaluate[notebook] replaces the current selection in a notebook with the result obtained by evaluating the contents of the selection in the kernel. ...
Subscript[x, y] is an object that formats as x_y. Subscript[x, y_1, y_2, ...] formats as x Subscript[y, 1], Subscript[y, 2], ....
SyntaxLength["string"] finds the number of characters starting at the beginning of a string that correspond to syntactically correct input for a single Mathematica expression.
ImageSizeMultipliers is an option that specifies how much smaller to render graphics that appear within other constructs.
GenerateConditions is an option for Integrate, Sum, and similar functions that specifies whether explicit conditions on parameters should be generated in the result.
$RootDirectory gives the root directory of your file system.
CountRoots[poly, x] gives the number of real roots of the polynomial poly in x.CountRoots[poly, {x, a, b}] gives the number of roots between a and b.
Heads
(Built-in Mathematica Symbol) Heads is an option for functions which use level specifications that specifies whether heads of expressions should be included.
ShowCellLabel is an option for Cell that specifies whether to display the label for a cell.