(written from a Production point of view)
The IKS K'Tanco was Kang's ship. Kor saw it in an extended version of the dream he had in the episode. This reference was found in the script for "The Sword of Kahless" but did not make it onto the screen. According to the script for this episode, the pronunciation for K'Tanco was "ka-TAHN-co".
The K'Tanco appears in Star Trek: Mere Anarchy: The Blood-Dimmed Tide under Kang's command. The video game Star Trek: Shattered Universe features a mirror universe K'Tanco. It should be noted that Kang is known to have commanded at least three unnamed ships.