A quote from http://www.unicode.org:
"Unicode provides a unique number for every character, no matter what the platform, no matter what the program, no matter what the language."
Examples (copied from sandbox)
╒═══╡ FUN WITH UNICODE! ╞═══════════════════════════════╗ │ ║ ├─► You can make cool stuff with unicode characters. ╚══► This is for fun,
│ Not serious content. ├─► But it might not work on some browsers and computers. │ ├─► Use a monospace font (begin your lines with a space at SL). │ └─► Full unicode tables are athttp://ppewww.ph.gla.ac.uk/~flavell/unicode/unidata.html