This is just an acronym that you still see and use today, though there were newer systems that are more expressive for other languages, non-romance languages.

这就是你仍在看到和使用的缩略词，尽管出现了新的语言系统,能够更好的表达其他的语言。

哈佛公开课 - 计算机科学课程节选

I don't know all of the acronyms.

我不太清楚那些缩略词。

耶鲁公开课 - 1945年后的美国小说课程节选