It is actually a form of binary machine code that is comprised of bursts of non-random static emitted through the cybernetic implants present in most tech-priests of the Mechanicus which cannot be understood by unaugmented Humans.
This digital language has been optimised for the rapid transmission of technical data to other tech-priests and to provide commands to servitors and other servant machines of the Mechanicus.
Even if the language's binary code could be translated into a form understood by normal humans, it contains multiple arcane references and allusions to the secret knowledge held only by devotees of the Cult Mechanicus.
The Lingua-technis is rarely used in the Imperium outside of the Forge Worlds of the Mechanicus. However, certain elements of the language can be found to have been integrated into the dialects of Low Gothic spoken on some of the Imperium's more highly industrialised or technologically advanced worlds.
Since the end of the Horus Heresy the ability to fully translate Lingua-technis has been a priority for the Inquisition, which is well-aware of the Adeptus Mechanicus' autonomous nature and the threat of heresy this presents for the rest of the Imperium.
However, in over 10,000 standard years, the Inquisition's best efforts have been unable to decipher even a rudimentary syntax for the machine language.