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IEC 60027-1 Ed. 6.0 b:1992
Letter symbols to be used in electrical technology - Part 1: General (Corrected and reprinted 1995-03-31)
Gives letter symbols for quantities and units used in electrical technology, and rules for their use and combination. Also specifies alphabets, subscripts, singularity functions, distributions and letter styles.
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International Electrotechnical Commission [iec]