The IKS Vorn was a Klingon Bird-of-Prey that was in service with the Klingon Defense Force in the mid-24th century.
In 2367, the Vorn was Duras's vessel when he attended the Sonchi ceremony after Chancellor K'mpec's death, and later the Rite of Succession held aboard the USS Enterprise-D. Lieutenant Commander Worf boarded the Vorn to claim the Right of Vengeance against Duras after he learned that Duras had killed his mate K'Ehleyr. (TNG: "Reunion")
According to the script for the episode , the pronunciation for Vorn was "Vorn".