This names a feature set -- a broader grouping, Cisco's own examples are fcoe and fex, that bundles related individual features together for combined licensing or activation control. This is a coarser-grained control point than the individual feature objects earlier in this MIB, letting an admin enable or disable an entire functional area, like FCoE support, in one action rather than toggling each constituent feature separately. Setting an action against the fcoe feature set would activate the whole FCoE functional area on the switch, rather than requiring separate individual activation of each FCoE-related sub-feature.