The Chinese language involves a number of spoken exclamative words and written onomatopoeia which are used in everyday speech and informal writing.
Exclamative particles are used as a method of recording aspects of human speech which may not be based entirely on meaning and definition.
[1] For example, 嘿 hei is derived from the mouth radical 口 and the character 黑 hei, which literally means "black", while 啞 originates from the mouth radical plus the character 亞 ya, meaning Asia.
Use of exclamative particles is highly informal, and it is advised that they not be used in formal documents or academic papers, unless it is specifically required to do so (such as the case of narration).
Exclamative particles are also used in the Korean language, such as the use of 에 (e) to represent surprise, although such usage is also considered informal.