This read-create INTEGER is the second tuple-pointer slot in an ACE; despite the source MIB's description text being copy-pasted from the first slot as 'Tuple 1 pointer,' its position in the table identifies it as the second of up to eight tuple references an ACE can combine. An admin uses this slot to add a second independent match condition to the same ACE, such as pairing a source-address tuple in slot 1 with a destination-port tuple here in slot 2. For example, to build a rule matching both a source subnet and a specific destination TCP port, the admin points slot 1 at the subnet Tuple and this second slot at the Tuple holding the destination port value.