This is the object's Relative Name — just the last path segment of its Distinguished Name, identifying this PCIe fatal-error counter set instance relative to its immediate parent object rather than the whole tree. An admin already navigating to the parent object (a specific blade or adapter) uses the rn to confirm which child stats or config object they've landed on without needing to re-parse the entire dn string. For a motherboard stats object this typically renders as a short fixed token such as 'board-temp-stats' rather than anything user-configurable.