The source DESCRIPTION for this object is blank, so this reading is inferred from its name, syntax (none/disabled/enabled), and table position alongside swL3ospfAreaType (which includes an nssa(3) option): it configures the NSSA Type-7-to-Type-5 LSA translator role for this OSPF area, i.e. whether this router acts as (or is eligible to act as) the ABR that translates NSSA external routes into standard external LSAs for the rest of the OSPF domain. Admins set this to enabled on the ABR that should perform NSSA translation for an NSSA area, since only an area configured as nssa makes this setting meaningful.