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Retrofukation
shutdown, Power off, system
LightGray
48x48
Human-O2
Power off, shutdown, Gnome
DarkRed
128x128
AEON
shutdown, turn off, Power off
256x256
Crysigns
shutdown, Power off, turn off
IndianRed
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Ginux
shutdown, Bye, turn off
Firebrick
64x64
Base Software
red, Box, Power off
turn off, Power off, yellow
Gold
Black Glamour
Power off, turn off, shutdown
Black
512x512
Phuzion
GNOME Desktop
system, shutdown, Power off
NX10
Power off, shutdown, turn off
Machemicals
Silver
Solid
turn off, shutdown, Power off
DarkGray
XP iCandy 3.1
Goldenrod
Pulse Pack
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I Like Buttons 3A
Power off, shutdown, perspective
Chocolate
turn off, Power off, cute
Signs & symbols
3D
Free 3d Glossy Interface Icon Set
electricity, Energy, Power off
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Desktop apps
Free Applications Icons
on, power, light
Crimson
24x24
Network & communications
Smooth
Oxygen
Shut down, Power off