This is the Relative Name (RN), a read-only string that distinguishes one instance of the SysDefaults object, which holds the domain-wide default settings applied when no more specific policy overrides them from its sibling instances under the same parent container. Because UCS Manager builds each object's full DN by concatenating RNs down the management tree, this value is the local naming piece an admin needs to understand how the object is addressed relative to its parent. For example, when a new service profile or pool is created without explicit settings and inherits domain defaults instead, comparing RNs lets an admin tell apart two sibling objects of this same class that share the same parent.