PNG ICO MORE
UI
3D
Gnome Web Icons
yes, ok, tick
Black
64x64
bulb, Idea, light
password, Gnome, 64
Dialog, Faq, help
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Computer & hardware
Discovery
Dialog, Information
32x32
Dialog, warning
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Desktop apps
Free Applications Icons
red, tick, yes
24x24
Human o2
Dialog, tux, question
128x128