Orion vessel
An Orion vessel was a type of vessel used by Orion pirates, a design that had not yet been encountered by the Federation in 2270, but which could be identified by its Orion markings. 

This type of Orion vessel, which was not identified as a starship, was armed with standard phasers, described as weak with a diffused, low-quality beam, and such a vessel could neither outrun nor outgun a  starship, but was powerful enough to overtake a  freighter. This type of vessel also emitted a unique trail of radioactive waste that was visible on a spectral analysis. 

In 2270, an Orion vessel attacked the  for its cargo of dilithium crystals, as well as a special supply of strobolin. It was later encountered by the  in a field of asteroids, where it was eventually surrendered and was towed to Deneb V. ()

de:Orionisches Piratenschiff
Vessel