A slender hovering maintenance robot of the 32nd century, successor to the DOT-7, several of which carried the Sphere data and helped retake the USS Discovery from Osyraa.
The DOT-23 is a small repair drone used aboard Starfleet ships and stations in the 32nd century. It replaces the boxy DOT-7 of the 23rd century, with a lighter frame, anti-gravity flight, two welding arms and a detachable head.
The robots are seen in the Discovery episode Scavengers, working with older DOT-7s on the ship's refit at Federation Headquarters.
They become characters in their own right in There Is a Tide and That Hope Is You, Part 2. When Osyraa captures Discovery, the Sphere data that lives in the ship's computer hides itself inside several DOT-23s. They aid Tilly and the bridge crew in their fight to retake the ship, and are damaged in the effort; Owosekun is carried to safety by one of them after setting a bomb in the nacelle.