I picked up a useful Emacs command from Xah Lee’s Emacs Blog. It’s from a comment by Stef on Lee’s Emacs & Unicode Tips page. It’s the list-character-sets command. When you call it, you get a list of all the character sets known to Emacs. If you select one of the sets you get a list of those characters and their hex code. Just the thing when you want to insert a little used character and can’t remember its codepoint.
It can only display one and two dimensional character sets (see the help page for more information on that) but as Stef points out unicode-bmp and unicode-sip display without problems even if unicode doesn’t. As Stef also points out, it’s very handy to figure out the font capabilities of your Emacs installation.
The never-ending Emacs adventure: there’s always something new to learn.