Cldr.Unit.known_measurement_system_names

You're seeing just the function known_measurement_system_names, go back to Cldr.Unit module for more information.
Link to this function

known_measurement_system_names()

View Source (since 3.5.0)

Specs

known_measurement_system_names() :: [measurement_system(), ...]

Return a list of known measurement system names.

Example

iex> Cldr.Unit.known_measurement_system_names()
[:metric, :si, :uksystem, :ussystem]