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iOS & Web User Interface Multi Circle Flat vol 2
notification, church, ring
Tomato
512x512
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Music
Flat
Business & SEO
music, Alert, Alarm
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24x24 Free Application
warning, wrong, Alert
24x24
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Farm-Fresh Web
Alert, wrong, warning
32x32
Tango
Alert, Dialog, Error
WP Woothemes Ultimate
stop, no, exclamation
256x256
Business & finance
Glyph
48x48 Free Time Icons
Abort, exclamation, Up
48x48
PNG MORE
Desktop apps
3D
Free Applications Icons
Alert, exclamation, General
Signs & symbols
Smooth
34aL volume 3.2 SE
Message, exclamation, warning