这是一个应该避免使用的非正式术语。该术语有时用于一种逻辑元件，这种逻辑元件可以实现特定的功能或在变量之间提供链接。 An improper term to be avoided. This term is sometimes used to designate a logic element which performs a specific function or provides a linkage between variables.
一种全局符号定义，它不能被与定义该全局符号的模块相链接的其它模块直接引用。 The definition of a global symbol that is not explicitly available for reference by modules linked with the module in which the definition occurs.