符号在深层意义上是人类文化的源代码，符号学便作为人类文化的元语言而发挥作用。
Symbol is the code of human culture; semiology behaves as the metalanguage of human culture.
元语言：为分析和描述某种特别研究的语言学符号和术语。
Metalanguage: certain kinds of linguistic signs or terms for the analysis and description of particular studies.
在这套系统中符号有六大功能——信息功能、表情功能、祈使功能、元语言功能、美感功能和酬应功能；
And what's more, language has six functions such as informative function, expressive function, evocative function, metalingual function, esthetic function and phatic function.
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