Vah was a Trill symbiont and one of the Annuated's caretakers. It was nearly two meters long and was several thousand years old as of the 2370s.

In the year 2376, Vah facilitated Ezri Dax's contact with the Annuated in the depths of the Caves of Mak'ala on Trill. (DS9 novel: Trill: Unjoined)