Barnett–Chao Romanisation

Barnett–Chao (abbreviated here as B–C) is a Cantonese Romanisation system based on the principles of the Gwoyeu Romatzyh system (GR) developed by Yuen Ren Chao 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) from Yuen Ren Chao's romanisation system.

Source: Wikipedia — Barnett–Chao Romanisation (CC BY-SA 4.0)