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Network & communications
Pixel
16x16 Free Application Icons
volume
Black
16x16
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UI
Bijou
10x10
5x10
Mixed
IconSweets 2
Key, volume, speaker
40x40
speaker, volume, sound
Fugue Icons
speaker, volume, low
volume, speaker
Arrows
Sanscons
volume, high
64x64
low, volume
Lynx Black
high, speaker, volume
medium, Audio, volume
volume, Audio, low
Audio, volume, muted
Gnome icons
Audio, low, volume
24x24
medium, volume, Audio
volume, Mute
Tango
volume, low, Audio
32x32
high, Audio, volume
muted, volume, Audio