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Interface
Flat
Essentials
Essentials, interface, symbol
Black
512x512
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Free icons for Windows8/Metro
volume, volume up, Up
DarkSlateGray
Freecns
Up, volume, volume up
LightGray
16x16
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Retina
volume up, Up, volume
Silver
64x64
default icon
media, volume, volume up
256x256
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iPhone Toolbar icons
volume up, volume, Up
Lavender
30x30
Simplicio
Ascending, rise, upload
128x128
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Music & multimedia
Outline
Multimedia
volume, volume up, speaker
speaker, volume, volume up