API Reference > imodeljs-frontend > QuantityFormatting > UnitSystemKey UnitSystemKey Type alias Beta Used to uniquely identify a unit system. There should be an entry for each entry in PresentationUnitSystem @presentation-common package "metric" -> PresentationUnitSystem.Metric "imperial" -> PresentationUnitSystem.BritishImperial "usCustomary" -> PresentationUnitSystem.UsCustomary "usSurvey" -> PresentationUnitSystem.UsSurvey UnitSystemKey = "metric" | "imperial" | "usCustomary" | "usSurvey" Defined in core/frontend/src/quantity-formatting/QuantityFormatter.ts Line 26 Last Updated: 11 June, 2024