The Yeht Fai-Tukh was a Vulcan T'Plana Hath-class surveyor in service to the Vulcan High Command's Space Forces in the 21st century. Her name when translated into Federation Standard was "True Knowledge".
During her service career, the Yeht Fai-Tukh surveyed Rigel IX, Andor, Tellar and Betazed. (Decipher RPG module: Starships)