This is the rn (Relative Name), the single naming segment that, appended to its parent's dn, forms the full dn for this one instance of the storage array or storage-target endpoint that an initiator ultimately connects to across the SAN/iSCSI fabric. UCS Manager derives this segment automatically from the object's own defining attribute (such as an address, index, or configured name), so seeing a distinctive rn like this is how you tell one StoreEp row apart from every sibling row under the same parent. For this class the rn typically looks like 'store-arrayA'.