This is the object's relative name (Rn) — just the last path segment of its Dn, the piece this Egress instance contributes to its own address within the MIT tree. This is the child object that actually carries the rate limit, burst size, and priority that get applied to outbound traffic on any vNIC or vHBA using the parent QoS policy. For this kind of object the Rn is typically built from the same identifying value as its Dn's final segment, e.g. the tail end of `org-root/ep-qos-def-gold-video/egress`, so two sibling instances never end up with colliding addresses under the same parent.