Cldr Units v3.7.0
Cldr Units

Cldr.Unit.measurement_systems

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

measurement_systems()

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This function is deprecated. Use Cldr.Unit.measurement_systems_by_territory/0.

See Cldr.Unit.measurement_systems_by_territory/0.