This is the Relative Name (Rn) of the record-definition object that specifies which packet fields a NetFlow monitor treats as flow keys and which extra fields it exports alongside them: the naming fragment that distinguishes this particular NetflowRecordDef instance from its sibling instances under the same parent object in the UCS tree. An administrator or a management application appends this Rn to the parent's DN to reconstruct the child's own DN, which matters because NetflowRecordDef objects are always addressed relative to whatever they are nested under (a port, a switch, or a monitor). For example, if two NetflowRecordDef instances sit under the same parent, only their Rn values differ, so software listing every NetflowRecordDef on a fabric interconnect relies on Rn to tell them apart.