Zhuyin Fuhao, often shortened as zhuyin and commonly called bopomofo, is a type of sound-based writing for the Chinese language. In Chinese, "bo", "po", "mo" and "fo" are the first four of the conventional ordering of available syllables. As a result, the four syllables together have been used to refer to many different phonetic systems. For Chinese speakers who were first introduced to the Zhuyin system, "bopomofo" means "zhuyin fuhao".