VBScript の定数、VarType 関数の定数

everyday VBScript 
MsgBox "vbEmpty: "   & vbEmpty   & " " & VarType(not_assign)
MsgBox "vbNull: "    & vbNull    & " " & VarType(Null)
MsgBox "vbInteger: " & vbInteger & " " & VarType(1)
MsgBox "vbLong: "    & vbLong    & " " & VarType(2147483647)
MsgBox "vbDouble: "  & vbDouble  & " " & VarType(1.0)
MsgBox "vbString: "  & vbString  & " " & VarType("")
MsgBox "vbDate: "    & vbDate    & " " & VarType(Date)
MsgBox "vbBoolean: " & vbBoolean & " " & VarType(True)

Dim a(3)
MsgBox "vbArray: "   & vbArray   & " " & VarType(a)

Dim ary
ary = Array()
MsgBox "vbArray: "   & vbArray   & " " & VarType(ary)

vbArray 不明