# μ? µ?

## μ和µ有啥区别？

μ在Unicode里是GREEK SMALL LETTER MU(U+03BC)，µ的是MICRO SIGN(U+B5)，在Emacs里，两个因为用了不同的字体，所以看起来不一样，可在其他地方两个看起来又是一样的。

Duck一下，发现了下面的话：

The symbol for the SI prefix micro- is a Greek lowercase mu. In Unicode, it has the codepoint U+00B5 (µ), distinct from the codepoint U+03BC (μ) of the Greek letter lowercase mu, so that machines can recognize it as the SI prefix symbol rather than as a letter. Most fonts use the same glyph for the two characters.