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Mixed
Flat
The shine of small things
time, Alarm, Alert
Black
512x512
Outline
Random - Crafticons
Misc, Alert
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Filled outline
Line color mix Vol.1
Megafone, Loud, megaphone
Line color mix Vol.2
Attention, Megafone, Alert
Mayssam
Error, Alert, danger
Glyph
Basic icon element
danger, warning, safety
Free Misc Icon Set 2
Alert, problem, exclamation
Error, sign, fill
Error, Alarm, warning
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Web Icons
Alert, ring, notification
Twitter UI Set
Alert, notification, ring
bitsies!
warning, Alarm, Alert
fault, problem, Error
Amenities - Outline
fire, Alarm, Alert
Handdrawn
Social Messaging & Productivity
danger, Attention, Error
Alarm, compass, Alert
event, Alarm, Direction
time, Clock, watch
Simple darkcon
problem, warning, Caution
Watchify v1.0 - 32px
Alert, warning, chime
Octicons
Alert
Smooth
Tango Icon Library
severe, Alert, weather
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Pixel
IconSweets 2
Alert, Information, Biu
40x40
Alert, Information