國語羅馬字
The Cantonese Romanisation system known as Barnett–Chao (abbreviated here as B–C) is based on the principles of the Gwoyeu Romatzyh system (GR) developed by Chao Yuenren in the 1920s, which he modified in 1947. The B-C system is a modification in 1950 by K M A Barnett (an Administrative Officer of the Hong Kong Government) which was adopted by the School of Oriental and African Studies, London (SOAS).