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ISO 31-0:1992 Quantities and units
ISO 31:1992 shared general information about principles concerning physical quantities, equations, quantity and unit symbols, and coherent unit systems, especially the International System of Units, SI, including recommendations for printing symbols and numbers. The first part includes a guide to terms used in names for physical quantities, the second part is a guide to the rounding of numbers, the third part is about international organizations in the field of quantities and units.
This standard has been withdrawn and has been revised by ISO 80000-1:2009
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