Old Cybertronian

Old Cybertronian is the common name for the Primal Vernacular, an ancient tongue compared to the modern Neocybex.
Fiction
IDW Generation 1 continuity
Neocybex came to prominence after Old Cybertronian fell to disuse. Rules of Disengagement
The Knights of Cybertron used "old Old Cybertronian" to leave a message inside the Matrix of Leadership, speaking of "many from one" (or "one from many") and a "guiding hand". The text served as a caption for the map contained within the Matrix. The text was somewhat translated by Rewind ten million years later.
Dai Atlas's name in Old Cybertronian was "Dei Atlas", meaning "God Map", which represented his desire to find the map leading to Cyberutopia. The Death of Optimus Prime
In the present day, the Decepticon Justice Division member Vos speaks only in Old Cybertronian. Rules of Disengagement The letters of the first sentence he speaks can be matched to English letters, but do not make sense in the context.
Under the influence of an ancient Titan, Rodimus unconsciously scribbled the phrase "set me free" in Old Cybertronian on Tailgate. You, Me, and Other Revelations The eight-million-year-old Cyclonus enjoyed singing in Old Cybertronian (with a Tetrahexian accent). The six-million-year-old Tailgate revered it as "the mother tongue" but didn't speak it himself, suggesting it had fallen into disuse by that time. Cybertronian Homesick Blues
In contrast, the Micronauts and other residents of Microspace spoke ancient Cybertronian as their everyday language. Valley ForgeEnter The Shadow
Notes
- In the IDW Generation 1 continuity, spoken Old Cybertronian is represented by Cyberglyphics, though what they spell is frequently gibberish.


