Null Keyword

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