UnitSystem extends Collection

Name	URL
metric	https://en.wikipedia.org/wiki/International_System_of_Units
english	https://en.wikipedia.org/wiki/English_units
planck	https://en.wikipedia.org/wiki/Planck_units
currency	Uses Fixer for exchange rates -- https://fixer.io

instance

name: string

Contains the name of the system of units of measurement (i.e. "metric", "english", "planck", ...).