# 9.4 符号属性

一个符号可以拥有任意多的符号属性，这些属性用来记录有关符号的各种杂项信息。比如，当一个符号拥有一个 risk-local-variable 属性，且该属性为 non-nil 时，这意味着这个变量是有文件局部风险的变量。

符号的的属性和属性值被以属性列表的形式储存在于符号的属性列表内。


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