The Unified Code for Units of Measure (UCUM) is a system of codes for unambiguously representing measurement units. Its primary purpose is machine-to-machine communication rather than communication between humans.[1] UCUM is used by different organizations like IEEE, and standards like DICOM, LOINC, HL7, and ISO 11240:2012.[2]
The code set includes all units defined in ISO 1000, ISO 2955-1983,[3][a] ANSI X3.50-1986,[4][b] HL7 and ENV 12435, and explicitly and verifiably addresses the naming conflicts and ambiguities in those standards to resolve them. It provides for representations of units in 7 bit ASCII for machine-to-machine communication, with unambiguous mapping between case-sensitive and case-insensitive representations.
A reference open-source implementation is available as a Java applet. There is also an OSGi-based implementation at Eclipse Foundation.
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