Synth ship
"Synth ships" were a type of Starfleet starship in the late 24th century. They were armed with at least one phaser array and torpedo launcher, and featured a large white Starfleet insignia on their ventral and dorsal hull.

A fleet of these ships in the Sol system were suddenly commandeered by rogue synths during the surprise orbital and suborbital Attack on Mars on First Contact Day in 2385. (; )

Vessels of this type were utilized by the Confederation of Earth during the Vulcan War in an alternate 2401. ()

Apocrypha 
In Star Trek Online the Synth Ships are referred to as belonging to the Deimos-class line of Pilot Frigates.
Federation starship classes