A replacement for the Gnome2 Character Palette applet (a.k.a. CharpickerApplet).
Somthing like
https://github.com/tobyS/indicator-chars would work.
I have actually been hacking together my own, but it's completely hard-coded and can't be customized. The applet should be able to use almost any UTF-8 character, and should place the character in the clipboard when clicked.
The original Character Palette placed its character table in gconf, and indicator-chars uses a hidden file in the home directory (~/.indicator-chars).
I don't have time to learn everything I'd need to make this customizable, but it would be very useful: I'd rather not learn all the strange compose key combos for math symbols etc. and it's a real pain to open Character Map and search for every needed character all the time. It's also pretty silly to make a text file and copy/paste from it.
I have several short lists of useful symbols, a few examples:
≃≅≈≠≡≤≥≪≫
αβγδεζηθικλμ
¤£¥¢$€©®°±Å
I had these set up in Character Palette and have been really missing them since my upgrade to Ubuntu 12.04 + Cinnamon 1.6.
P.S.
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this.set_applet_icon_symbolic_name("accessories-character-map-symbolic");
works great for an icon with
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"icon": "accessories-character-map"
as the icon in metadata.