Bukkit

• What's UnicodeText?

UnicodeText is a simple and very lightweight, yet nice and useful, plugin made to make servers' characters a little bit more cool.

• What can it do?
  

Through UnicodeText you can write in chat or display on signs or, even cooler, use in commands
UNICODE CHARACTERS. To insert an unicode character you need to know the wanted character 4-Digits combination. For example a nice bold heart has an unicode combination of 2674. Just type where you want \u2674 and the heart will appear!

For further information take a look on Wikipedia: Unicode

• Permissions

unicodetext.*                   - Gives access to every feature of the plugin.
unicodetext.chat              - Gives access to write unicode characters in the chat.
unicodetext.sign              - Gives access to write unicode characters into signs.

unicodetext.command   - Gives access to use unicode characters in commands.

• Other and technical information

The way the plugin works depends only by how Minecraft (and partially Java) is designed.
Not every single unicode character will work, some of them will display blank text instead.
However the most common and useful characters do work.
In the chat and on commands you can use the special character \n. This will append a new line to the text.
The new line works, you can test it by simply writing This\nIs\nA\nTest in the chat. But it doesn't work in signs.

• Source

Available on GitHub