As of 1 January 1997, all IEC publications are issued with a 60000-series designation. For example, IEC 23-1 is now referred to as IEC 60023-1.
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MUSCOVITE(1) Is "designation" the only term that works ok in this context?No other term springs to mind—certainly not 'notation' (which just means 'note')—but if the text is for knowledgeable readers, you can omit the noun entirely: