The Luminoth language is a language spoken by the alien species Luminoth from the Metroid universe. The language has never been heard spoken, only seen written.
The Luminoth language uses an interesting alphabet: three-dimensional symbols. These letters use a system of dots and lines on a 3D grid. A single word forms one cluster of these lines and dots, and a sentence will then contain an amount of clusters. Letters are connected to each other by a bright dot that is part of both letters. Luminoth writing can be seen on the Luminoth Lore Projectors and the Luminoth Lore in Metroid Prime 2: Echoes.
When U-Mos first updates Samus Aran's Translator Module, she is able to access various devices and Translator Doors with violet holograms. The holograms of deceased sentinels of various temples later provide her with access to the other color codes.
Several plants and carvings (such as on elevators) can be found that resemble this language.
Randomizers contain what appear to be a question mark styled in the Luminoth language. The shape actually suggests symbol of the letter "n" on closer inspection.
The Varia Suite album of the fan site Metroid Metal is titled in the Luminoth language.
It is unknown whether or not the language corresponds to the vocalizations made by U-Mos.
The word "ing" in Luminoth translates to "terror".