The Leyron were a species native to the planet Malkus IX.

Leyron were considered unique as they were one of few known species to have developed a written language significantly before developing a spoken or sign language. (TNG: "Loud As A Whisper")

Kathryn Janeway once studied the gestural idioms of the Leyron, which she found more comprehensible than the non-verbal language of the Tak Tak. (VOY: "Macrocosm")

According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 7), the sign language M-9 was developed by the Leyrons.

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