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Business & finance
Glyph
Font Awesome
Up, volume
Black
512x512
Down, volume
volume, off
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Outline
Office Time
Loud, music, volume
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24x24 Free Application Icons
volume
24x24
volume, off, music
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Swanky Outlines
volume, Maxim
256x256
Devine Icons Part 2
Full, volume
128x128
medium, volume
low, volume
off, volume
iOS 7 icons
high, volume
volume, medium
Smooth
Luisance Pack
bleu, volume
Orange, volume
volume, rouge
volume, vert
volume, violet
Wireframe mono icons
Audio, sound, speaker
48x48
volume, Down, sound