Qin class

The Qin-class was a class of heavy raptor fielded by the Klingon Defense Force in the early 25th century. The class was also in use in the mirror universe. 

Technical data
Like most Klingon starships of the era, the Qin-class was armed with disruptors and photon torpedoes and carried a cloaking device. 

In 2410 the Klingon Empire deployed a heavy escort carrier variant, the. 

Background
The name "Qin" appears to be a misspelling of the tlhIngan Hol word "QIn", meaning "sharp end" (e.g. of a spear).