AT: "ar" 208 was the registry number of a jump ship that did not have warp capabilities.
In 2259 of the alternate reality, 208 was commandeered by Khan Noonien Singh following the bombing of the Kelvin Memorial Archive. During a meeting at Starfleet Headquarters, Spock wondered why Khan would have taken the craft. Khan then used the vehicle to attack the attendees of the same meeting, before transwarp beaming to Qo'noS. (Star Trek Into Darkness)
Concept artwork of 208 was illustrated by James Clyne. (A concept image of the vehicle on Scott Chambliss's website can be found here.)