问题
I came across this cute little symbol today:
🔮
I couldn't figure out what it was, so I searched for reverse lookup services and character maps that might be able to reveal a name to no avail. I know, however, that Windows' character map program knows the names of symbols:
How does Windows accomplish this? How might I, but a lowly programmer, divine this same knowledge? What encoding system does Unicode use to tie a symbol to its description?
回答1:
This information comes from the Unicode Character Database.
Specifically, the code points and their names (and other info like the category of a code point) are defined in UnicodeData.txt.
A lot of programming languages have this information in the standard library, eg. the unicodedata module of Python.
回答2:
If you just want to know the glyph name, head on over to CodePoints (or Graphemica or probably any one of a dozen other sites) and do a search on it. I'm not sure which lookup services you used "to no avail" but those two have no issues in locating it.
Doing so with 🔮 will lead you to codepoint U+1F52e, which will give you the descriptive name "CRYSTAL BALL", along with all sorts of other useful information about it.
来源：https://stackoverflow.com/questions/39360359/how-does-one-go-from-a-unicode-character-to-its-description