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UI
Glyph
Google Material Design icons
low, brightness
Black
512x512
Network & communications
Material Device
low, cellular, Bar
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Wifi, low, signal
Typicons
Battery, low
Freecns Cumulus
thermometer, low
Computer & hardware
Ionicons
low, Battery
volume, low
low, volume
Mixed
WPZOOM Developer Icon Set
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Business & finance
24x24 Free Application Icons
rating, low
24x24
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Devine Icons Part 2
128x128
Wireframe mono icons
volume, Down, sound
48x48