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Organizationally unique identifier

24-bit number in networking equipment that uniquely identifies its seller/producer

Pronunciation
/ˌɔːɡənʌɪˈzeɪʃənəli juːˈniːk ʌɪˈdɛntɪfʌɪə/
/ˈˌɔrɡənəˈzeɪʃnəli juˈnik aɪˈdɛntəˌfaɪər/