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Business & finance
Glyph
Font Awesome
Up, volume
Black
512x512
Down, volume
volume, off
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24x24 Free Application Icons
volume
24x24
volume, off, music
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Devine Icons Part 2
Full, volume
128x128
medium, volume
low, volume
off, volume
Wireframe mono icons
Audio, sound, speaker
48x48
volume, Down, sound