UnitsML is a standard for units of measure, and UnitsDB is the database that contains enumerative elements used by UnitsML.
UnitsDB includes the following content:
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Unit systems
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Units of measure
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Prefixes
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Constants
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Quantities
Such content is hosted at the official UnitsDB repository at https://github.com/unitsml/unitsdb.
This repository contains the Ruby codebase for UnitsDB, which is used to access and manipulate the UnitsDB content.