Where are the stock-icon-names defined for the unity-panel-service indicators and notify-OSD?
notify-send
uses icon from the /usr/share/icons/gnome/32x32
(& also /usr/share/notify-osd/icons/...
)
devav2@devav2:/usr/share/icons/gnome/32x32$ ls
actions apps devices emotes places
animations categories emblems mimetypes status
Above results are the different icons sets available for notify-send
devav2@devav2:/usr/share/icons/gnome/32x32$ ls emotes/
face-angel.png face-sad.png stock_smiley-13.png
face-angry.png face-sick.png stock_smiley-15.png
face-cool.png face-smile-big.png stock_smiley-18.png
face-crying.png face-smile.png stock_smiley-1.png
face-devilish.png face-smirk.png stock_smiley-22.png
face-embarrassed.png face-surprise.png stock_smiley-2.png
face-glasses.png face-tired.png stock_smiley-3.png
face-kiss.png face-uncertain.png stock_smiley-4.png
face-laugh.png face-wink.png stock_smiley-5.png
face-monkey.png face-worried.png stock_smiley-6.png
face-plain.png stock_smiley-10.png stock_smiley-7.png
face-raspberry.png stock_smiley-11.png stock_smiley-8.png
Example:
notify-send -i face-glasses "I am wearing glasses"
notify-send -i face-laugh "I am happy"
You can use the stock icons from other directories as well (devices,places, etc)
Apart from this you can use custom locations for icons
Example: notify-send -i /usr/share/pixmaps/gnome-irc.png "Icon Test"
I don't know if they're found in a list format somewhere in the hard disk, but there's a list on the web here:
https://specifications.freedesktop.org/icon-naming-spec/latest/ar01s04.html