Bopomofo  or Mandarin Phonetic Symbols, also named Zhuyin (Chinese: 注音), is a major Chinese transliteration system for Mandarin Chinese and other related languages and dialects which is nowadays most commonly used in Taiwanese Mandarin. It is also used to transcribe other varieties of Chinese, particularly other varieties of Mandarin Chinese dialects, as well as Taiwanese Hokkien. Consisting of 37 characters and four tone marks, it transcribes all possible sounds in Mandarin. Bopomofo was introduced in China by the Republican Government in the 1910s and used alongside the Wade–Giles system, which used a modified Latin alphabet. Bopomofo is an official transliteration system in Taiwan, being widely used as the main electronic input method for Mandarin Chinese in Taiwan (ROC) and used in dictionaries and other documents.

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