Numenera and You
The Truth: The Aeon Priests teach a language based on rationality and intellect. Because of its name, it means something different in the Ninth World to say, “She speaks the Truth,” but that subtle double meaning is intentional on the part of the priesthood.
The language’s rules are simple and straightforward, easy to teach and easy to learn. The Truth is the predominant language in the Steadfast, where it’s spoken by about 80 percent of the people; in cities, that number is closer to 100 percent. In the Beyond, about 60 percent of the people speak the Truth as their primary language, but many isolated villages have their own specific tongue.
Shin-Talk: This is a crude and simple language used only for trade and related tasks—counting, assessing quality, and so on. Shin-Talk is older than the Truth but not as widely used.
Other Languages: At least 500 (and perhaps far more) completely distinct languages are spoken across the Ninth World. It’s not unusual for a traveler to discover an isolated village—particularly in the Beyond—and be unable to speak to its few hundred residents because they have their own language. Fortunately, this is a common problem, so people are used to struggling through interactions without relying on words.