NaN Property (Global) (JScript 5.6) 

Returns the special value NaN indicating that an expression is not a number.

NaN 

Remarks

The NaN property (not a number) is a member of the Global object, and is made available when the scripting engine is initialized.

Requirements

Version 3

Applies To: Global Object (JScript 5.6)

See Also

Reference

isNaN Method (JScript 5.6)