The Shir'Kahr-class was a type of frigate that saw service with the Federation Starfleet during the 24th century. They were designed for exploration and scientific research and named after the Vulcan city of the same name. (Spacedock: The Advanced Starship and Construction Manual) The USS Nyria was a Shir'Kahr-class vessel assigned to the Starfleet Eighth Fleet at the start of the Dominion War. (The Dominion War Sourcebook: The Fires of Armageddon)