Lingua.all_languages_with_devanagari_script

You're seeing just the function all_languages_with_devanagari_script, go back to Lingua module for more information.
Link to this function

all_languages_with_devanagari_script()

Get the list of supported languages using Devanagari script.

Example

iex> Lingua.all_languages_with_devanagari_script()
[:hindi, :marathi]