Bopomofo, also called zhuyin or occasionally zhuyin fuhao, is a transliteration system for Standard Chinese and other Sinitic languages. It is commonly used in Taiwan. It consists of 37 characters and five tone marks, which together can transcribe all possible sounds in Mandarin Chinese.

Wu Jingheng, commonly known by his courtesy name Wu Zhihui, also known as Wu Shi-Fee, was a Chinese linguist and philosopher who was the chairman of the 1912–13 Commission on the Unification of Pronunciation that created Zhuyin and standardized Guoyu pronunciation.