There used to be an application in KDE (similar to the one in Windows) that would show all of the characters in a font and either the keystroke or the unicode mapping for a particular character within a font. It's not something I use very often but is invaluable when you need it.
I can not find this application in my current installation, nor can I remember the name.
I need to add the degree symbol in an email.
Pointers on how to input this symbol, or find/install the app that would let me solve this on my own, are greatly appreciated,