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UI
3D
Gnome Web Icons
volume, Audio, muted
DarkGray
48x48
volume, high, 48
CornflowerBlue
volume, medium, 48
Gnome, Control, volume
WhiteSmoke
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Gnome, high, Audio
Black
64x64
Audio, low, 64
128, muted, Audio
medium, Audio, 64
Control, Gnome, Multimedia
Family & home
Saint Valentines Day
speaker, sound, volume
150x150
Mixed
The Spherical icon set
sound, Mute, volume
MidnightBlue
128x128
announcement, sound, speaker
volume
Computer & hardware
Discovery
volume, Audio, low
32x32
high, volume, Audio
volume, medium, Audio
Audio, muted, volume
volume, speaker
speaker, volume
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Desktop apps
Free Applications Icons
volume, sound, Audio
DodgerBlue
24x24
Human o2
medium, Audio, volume
DimGray
high, Audio, volume
volume, low, Audio