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Signs & symbols
Glyph
Web UI
music, sound, speaker
Black
512x512
Business & finance
Font Awesome
Up, volume
Down, volume
volume, off
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Miscellany Web icons
Audio, volume, speaker
Mixed
Free Misc Icon Set 2
off, sound, speaker
on, sound, Audio
iOS7 optimized
Miu
speaker, loudspeaker, Mute
Device, sound, speaker
volume, loudspeaker, Audio
Audio, loudspeaker, sound
speaker, sound, volume
volume, loudspeaker, Device
Device, volume, Down
Down, speaker, Audio
UI
Google Material Design icons
ring, volume
News and Magazine
volume, media, Multimedia
DarkSlateGray
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Blogger
sound, volume
40x40
Cool Application Icons
Min, sound, player
Mute, volume
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Network & communications
Iconico
Options, system, settings
1024x1024