Astromech droid (Earth-2356)

An astromech droid, also referred to as an astro droid, is a type of repair droid that serve as an automated mechanic on starships. These compact droids use tool-tipped appendages stored in recessed compartments. Many starfighters rely on astromech copilots to control flight and power distribution systems. Sitting in an astromech socket exposed to space, the droid, in addition to its piloting duties, can calculate hyperspace jumps and perform simple repairs.

Most astromechs are only able to communicate in writing, conveyed via another computer system, or through a special code of clicks, bleeps, and similar sounds, known as binary. However, certain other droids, such as C-3PO, can understand the binary code of astromechs, and often translate from binary to other languages.

Astromech droids average 0.93 meters in height, while R-series droids from the R2 line forward had a height of just over a meter.

Source

 * https://starwars.fandom.com/wiki/Astromech_droid.