The Planfa were a group that existed within Vulcan society.
This sect of wandering monks were one of the few that "Plat-vok" discipline from the Path of Plat. The order was dedicated to promoting a deep and harmonious marriage as well as friendships. Planfa monks only taught the plat-vok rite to either a pair of extremely close friends or lovers. They also knew th "Vhoshanta" body reading art from the Path of Vhos which they used to help them in dispensing advice and aid to those who were in need. (Last Unicorn RPG module: The Way of Kolinahr: The Vulcans)