This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
The Klingon cleave ship was a type of Klingon warship in service during the 23rd century. Massive in size, it mounted a large vertical blade on its bow that enabled it to ram and destroy opposing starships.
During the Battle of the Binary Stars in 2256, T'Kuvma ordered a cloaked cleave ship to ram USS Europa as a demonstration of the invisibility technology. The Europa proceeded to self-destruct, destroying both ships. (DIS: "Battle at the Binary Stars")
In 2257, High Chancellor L'Rell commanded a cleave ship that reinforced USS Discovery and USS Enterprise in their battle against Control. The vessel rammed and destroyed two Section 31 ships as it decloaked. (DIS: "Such Sweet Sorrow, Part 2")