在程序和系统分析中，所采用的各种标准和约定，包括为特定的系统和程序所制定的缩写字、符号及其含义。

Standard and accepted procedures in programs and systems analysis. The abbreviations, symbols, and their meanings developed for particular systems and programs.

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.