A small, long-limbed repair robot carried aboard Starfleet ships of the 23rd century, used for hull maintenance and damage control on the USS Enterprise and USS Discovery.
The DOT-7 is an autonomous maintenance drone with a flat head, a single display for a face and spindly arms. Units are stored in the hull and deployed to carry out exterior repairs that would be dangerous for the crew.
The robots are first seen in the Discovery second-season finale Such Sweet Sorrow, swarming over the hulls of the Enterprise and Discovery to patch damage during the battle with Control's fleet. One is the co-star of the animated Short Treks episode Ephraim and Dot, pursuing a tardigrade through the Enterprise.
Its 32nd-century successor, the DOT-23, serves aboard the refitted Discovery.