Unit Representation Systems

  • Guide for the Use of the International System of Units (SI) (SP811)
  • Hypertext Markup Language (HTML)
  • International Electrotechnical Commission (IEC)
  • International Virtual Observatory Alliance: Units in the VO (IVOA)
  • IUPAC Quantities, Units and Symbols in Physical Chemistry (IUPAC)
  • Metric Interchange Format (MIXF)
  • National Environment Research Council (UK) (NERC)
  • NCI Thesaurus in OBO (NCIT)
  • Ontology of Units of Measure (OM)
  • Quantities, Units, Dimensions, and Datatypes (v1) (QUDT1)
  • Quantities, Units, Dimensions, and Datatypes (v2) (QUDT2)
  • Semantic Web for Earth and Environmental Technology (SWEET)
  • SIUnitx LaTeX Package (SIUNITX)
  • UDUnits (UDUNITS)
  • Unified Code for Units of Measurement (UCUM)
  • United Nations Economic Commission for Europe (UNECE)
  • Units Ontology (UO)
  • Wikidata.org (WDATA)