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Mixed
Smooth
Gradient Runded Glowing Icons
Alert
MediumAquamarine
128x128
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Tango Icon Library
severe, Alert, weather
Black
512x512
UI
All Google icons
O, Alert
DarkOrange
Alert, B
DodgerBlue
Social media
Brushed Metal Icons
Desktop apps
Farm-fresh
Price, Alert
DarkSeaGreen
32x32
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Files & folders
Spirit20
Calendar, Alert
Silver
20x20
printer, Alert
DarkSlateGray
Bunch of Bluish Icons
exclamation, Alert, warning
DeepSkyBlue
Simplicio
warning, Alert, Attention
Goldenrod
Computer & hardware
VistaICO Toolbar Icons
Alert, Alarm, ringtone
256x256
Alert, way
Firebrick
Alert, restricted
Addictive Flavour
Alert, Clipboard
WhiteSmoke
48x48
Cloud, Alert
Lavender
mail, Alert
user, Alert
Alert, group, user
Ultimate Gnome
severe, weather, Alert
Music & multimedia
Ose
Alert, exclamation, warning
Brown
Business & finance
Pretty Office
Alert, exclamation
Chocolate
Soft Icons
warning, Alert, exclamation
SaddleBrown
Basic Set
exclamation, Alert
Orange
64x64
One bit
exclamation, Alert, notice
DarkGoldenrod