Zhang Binglin, also known by his art name Zhang Taiyan, was a Chinese philologist, textual critic, philosopher, and revolutionary.
Zhang Binglin in 1899
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.
Table of Bopomofo, with romanization given in Gwoyeu Romatzyh
Bopomofo in Regular, Handwritten Regular & Cursive formats
An example of a Bopomofo keypad for Taiwan
A guide on how to typeset Bopomofo alongside characters. (1936, Li Jinxi)