The MIB's DESCRIPTION for cucsLicenseInstanceFsmStageRn is only the auto-generated stub 'Cisco UCS license:InstanceFsmStage:rn managed object property', but the 'rn' property name together with its SnmpAdminString type tell us this column, on one stage inside that license-instance activation FSM, holds this object's relative name as UCS Manager's data model defines it, exposed here as a read-only SNMP value (read-only). The Rn is just the last arc of that same Dn — the naming-coordinate segment specific to this one license-instance FSM stage, which is what changes from row to row while the parent path stays fixed, so it is useful for telling sibling license-instance FSM stage entries apart under the same parent without printing the whole Dn. Continuing the earlier example, the Rn here would just be the trailing segment, something like 'stage-Activate'.