Zhuyin fuhao (Chinese: 注音符號), often abbreviated as zhuyin and colloquially called bopomofo, is a phonetic system for transcribing Chinese, especially Mandarin. It was introduced in the 1910s. Consisting of 37 characters and four tone marks, it transcribes all possible sounds in Mandarin. Although phased out in People's Republic of China in the 1950s, this system is still the most widely used educational tool and Chinese computer input method in Taiwan.

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