Worldsweeper

The D-Class Worldsweeper, P-6 model is a famous model of Decepticon warship mimicking the Decepticon insignia, earning them the informal name of Symbol Ships. They possess several notable features and attributes, including a complement of Cybernoughts, and an unfortunate tendency to crash.
Fiction
IDW Generation 1 continuity
The Worldsweepers saw action during the height of the Decepticon offensive, and were associated with the heyday of the Decepticon Empire. The Decepticons stationed at least one Worldsweeper over every planet in the Constellate. Noted Decepticons like Shockwave and Sixshot have commanded their own Worldsweepers in the past. Who's Afraid of the DJD?
During the war, a fleet of Worldsweepers known as the "Phantom Fleet" went missing in the Dark Nebula. Anomie
A Worldsweeper crashed on the planet Clemency that contained some deformed protoforms, a ceiling covered with brain modules, and organic flesh that had been bled into the ship's fuel supply, polluting it. Also, there was a non-functional robot made entirely of wood. A band of Decepticon Scavengers led by Krok later found the ship and went aboard where they discovered a stasis-locked Grimlock. Rules of Disengagement Under threat from the Decepticon Justice Division, the Scavengers staged an ambush near the Worldsweeper using the circuit speeder-spiked Grimlock as bait. During the ensuing battle, Crankcase took control of one of the ship's Cybernoughts, but when the D.J.D. left the field of conflict to pursue bigger fish, the Scavengers abandoned the Worldsweeper and left Clemency in the Weak Anthropic Principle. Who's Afraid of the DJD?
Just before annexing Earth into the Council of Worlds, Optimus Prime had a series of visions, including the scene of a Worldsweeper crashed near the White House. Once Upon a Time on Earth
After the war on Necroworld, Drift had a vision of the Phantom Fleet being led by Pharma along with several sparkeaters bearing down on him, Rodimus and Grimlock. Some Other Cybertron. He later confessed this to Ratchet when Team Rodimus passed a building-sized statue of Primus in the Functionist Universe. Anomie
A mystery faction of 'bots with a green, gear-like insignia used Worldsweepers as their main method of transportation, and were probably the previous owners of the one above. Evidently, besides crashing all the time, their speed also left something to be desired. Animals The 'bots were employed by the Grand Architect, who was well-known for his appreciation of Worldsweepers, despite their lack of speed. They tracked down Anode and Wipe-Out on Troja Major using their ship. An Axe to Break the Ice
Notes
- The Worldsweeper bears an obvious resemblance to the temporary Decepticon base from "Enter the Nightbird" as well as the more obscure Destron Mark from Transformers: Mystery of Convoy.

