Lincos
Lincos was a mathematics-based language developed on Earth thought to be helpful in establishing communication with extraterrestrial species.

In 3190, Saru compared the bridge language Species 10-C taught the  crew to Lincos. Captain Burnham decribed Lincos as "A language based on math. The 21st century Earth organization METI predicted that it would be helpful in extraplanetary communication."  ()

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Earth languages‎