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Unified numbering system

an alloy designation system widely accepted in North America

Pronunciation
/ˈjuːnəˌfaɪd ˈnʌmbərɪŋ ˈsɪstəm/
/ˈjuːnɪfʌɪd ˈnʌmbəiŋ ˈsɪstəm/