Unified Code for Units of Measure (UCUM)
The Unified Code for Units of Measure (UCUM) is a standard code system to communicate units of measure between computer systems and between humans and computers. It represents all physical units in the SI (and predecessor) systems, and meticulously incorporates the customary units still in use in the U.S. and few other parts of the world. The UCUM has been adopted in the data interchange standard world including DICOM, GIST consortium, HL7, and HITSP.