Trinary syntax was a computer language used by cultures in the galaxy, including the Federation.

In 2374, when Arturis was asked by Captain Kathryn Janeway about his skills with computer trinary syntax and algorithms, he replied that they were "all the same" to him. (VOY: "Hope and Fear")

An early version of the script of Star Trek: First Contact mentioned the computers in the Phoenix launch complex using a "trinary language" that by 24th century standards was considered archaic.
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