The Triannon vessel was a type of starship class used by the Triannon species in the mid-22nd century.
A ship of this type under the command of Pri'Nam D'Jamat left Triannon in late 2152, making a 6.3 light year trek in about a year.
In November 2153, Enterprise NX-01 came to the aid of D'Jamat's vessel, when it appeared to have been disabled by the spatial anomalies present in the Delphic Expanse. In reality, the crew had faked their distress call in order to capture the Earth Starfleet ship which they intended to use to end a religious war on their homeworld. D'Jamat used the captured Enterprise to battle four vessels of this type under the command of Ceris, and noted to Ceris it would take ten of these vessels to match Enterprise's fire power. After damaging Ceris' ships, with the intention of targeting their reactors, D'Jamat's forces were thwarted by the crew of Enterprise. (ENT: "Chosen Realm")
In the final draft script of "Chosen Realm", this type of ship was initially twice described as "small" before a fuller scene description referred to D'Jamat's ship as "a good deal smaller than Enterprise, space-worn and battered." The script additionally specified that the other Triannon craft were to be "identical in configuration to D'Jamat's ship."
The design of this starship was created by John Eaves, who inked four different concepts for this ship in early October 2003. One of the sketches later became the Denobulan shuttle seen in the episode "The Augments". [1]