Need a 32x32 transparent PNG to represent suspend consistent with the shutdown one. This should be added to rART in the same location as the shutdown button. A pause (⏸) would probably do the trick.
I've made the following icon, hope to hear some feedback. It's simple, black, tried to get the same thickness as the shutdown one. I'm not exactly sure what "add to rART" means, however.
Icon XML paste.