This read-create integer is tuple pointer #2 for the ACE, referencing another matching-criteria element used alongside the ACE's other tuples to define what traffic it catches. Because a single ACE can combine several tuple pointers, this second slot lets the rule incorporate an additional match dimension beyond the first. For example, tuple pointer 2 could reference a destination-port entry, so combined with tuple 1's source address the ACE matches a specific source-to-port flow.