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Signs
Flat
Weapons
Energy, Alert, power
Goldenrod
512x512
Alerts
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Signs & symbols
Glyph
Buttons
power, switch, on
off, turn off, on
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SEO & web
Metro Uinvert Dock
power, Lock
256x256
Social media
Metro UI Dock
Lock, power
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Desktop apps
Lock, Mirror, power
640x640