The Voroth-class was a type of surveyor used by the Vulcans during the 21st and 22nd centuries. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era)

The Voroth consisted of three elongated structures joined to form a Y-shaped hull with three landing struts beneath. Tho of the structures joined to warp nacelles with the third having the ship's impulse engine.

This class is meant to represent the type of Vulcan vessel seen in Star Trek: First Contact. It identifies that ship as the VSS Kah'nath.