generic single-word generic vocative marker; identifies intended listener with a single, possibly non-Lojban word, delimited by pauses (in speech) or by whitespace (in writing).
Named reference. It converts a sumti into another sumti. The converted sumti points to the referent the name of which is the referent of the unconverted sumti.
vocative marker: identifies the station(s) to which a message is to be sent and at the same time prepares a universe of discourse by filtering from a stream of messages only those said by that station(s)