
Group: Constant
Description:
A variant 
 expression that is null. A null value propagates through an expression 
 causing the entire expression to be Null. Attempting to use a Null value 
 as a string or numeric argument causes a run-time error. A Null value 
 prints as "#NULL#".
Example:
Sub 
 Main
  X = Null
  Debug.Print 
 X = Null '#NULL#
  Debug.Print 
 IsNull(X) 'True
End Sub