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The Romanization of Hangeul (Korean: 한글의 로마자 표기법; literally Roman letter notation of Hangeul), also known as RR transliteration (Revised Romanization transliteration), was the official Hangeul romanization system in South Korea proclaimed by Ministry of Education replacing the older International Phonetic Notation of Korean phonology (Korean: 조선어음의 만국 음성부호 표기), from 1959 to 1984.
References
Revised Romanization of Hangeul Wikipedia(Text) CC BY-SA