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Android icons
frequency, amplify, wave
DarkGray
72x72
pyramid, amplify, frequency
frequency, amplify, right
zoom, frequency, wave
wave, frequency, checkmark
amplify, wave, Up
Add, wave, frequency
wave, right, frequency
star, reduce, frequency
frequency, low, Reload
frequency, cancel, amplify
Reload, frequency, reduce
wave, frequency, low
frequency, wave, amplify
iPhone Icons
frequency, reduce, wave
Black
40x40
high, frequency, wave
wave, amplify, frequency
low, wave, frequency
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Oxygen-Refit
frequency, processor, Gnome
DarkSlateGray
128x128
Human-O2
Cpu, frequency, processor
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Mixed
Outline
Cute Tech Icon Set
radio, frequency, Fm
512x512
Computer & hardware
3D
Human o2
frequency, Applet, Cpu