The Lanai language served as the method of communication for the Lanai species dwelling on the planet of Ahch-To; it is a language. Alcida-Auka mentioned that the most recent Outsider had become proficient in both the language and customs of the Lanai following his arrival on the island.
This language incorporated both verbal expressions and manual gestures. While a written form existed, it was seldom employed; instead, fire signals typically facilitated communication across greater distances. Lanai-song involved a blend of whistling sounds and throaty vibrations, typically produced while performing daily tasks.