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Computer & hardware
Glyph
Ionicons
volume, low
Black
512x512
volume, high
low, volume
volume, medium
Mute, volume
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Mixed
Iconic
DarkSlateGray
volume
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Business & finance
24x24 Free Application Icons
sound, video, silence
OrangeRed
24x24
volume, off, music
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Social media
Win8 and iOS Tab Bar Icons - free
vintage, volume, radio
60x60
Pittogrammi
speaker, volume, sound
sound, speaker, volume
volume, Loud, sound
Devine Icons Part 2
Full, volume
128x128
medium, volume
off, volume
UI
Windows 8 metro style
Down, volume
SEO & web
Metro Uinvert Dock
256x256
SeaGreen
volume, Running, Not
Firebrick