In epistemology, the prefix meta- is used to mean about (its own category). For example, metadata are data about data (who has produced them, when, what format the data are in and so on).
Meta is Greek and means beyond (the real, actual) stuff.
Interestingly Meta-Physics means "Beyond the Physics", and comes from a Greek philosopher who wrote some books. One was "Physica" (these natural sciences), the next one "Meta-Physica" (because it came after, or beyond the "Physica") (and it dealt with the super natural scienses, e.g. religion). .... Nice anectode from a philosophy lecture, that helped me to remember these basics :-)
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参考：维基百科
Reference: Wikipedia
Meta 是希腊语，意思是超越（真实的、实际的）东西。
有趣的是，元物理学的意思是“超越物理学”，来自一位写过一些书的希腊哲学家。 一个是“物理学”（这些自然科学），下一个是“元物理学”（因为它出现在“物理学”之后或之上）（它涉及超自然科学，例如宗教）。 .... 哲学讲座中的精彩轶事，帮助我记住了这些基础知识:-)
KR，托马斯
Meta is Greek and means beyond (the real, actual) stuff.
Interestingly Meta-Physics means "Beyond the Physics", and comes from a Greek philosopher who wrote some books. One was "Physica" (these natural sciences), the next one "Meta-Physica" (because it came after, or beyond the "Physica") (and it dealt with the super natural scienses, e.g. religion). .... Nice anectode from a philosophy lecture, that helped me to remember these basics :-)
KR, Thomas
模板元程序是生成程序的程序，因此这是 Dreas 所建议的关于其自身类别的元含义的另一个示例。
Template meta-programs are programs that produce programs, So this is another example of meta meaning about its own category as Dreas suggested.