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Desktop apps
3D
Free Applications Icons
warning, ban, Block
Black
24x24
danger, Message, Attention
Goldenrod
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Business & finance
Phuzion
warning, Alert
128x128
Computer & hardware
Human o2
Alert, weather, severe
DarkSlateGray
Alert, warning
Orange
48x48
Mixed
Iconza
Alert
32x32
important, Alert, Folder
Chocolate
Flavour Extended
Alert, Comments
Gainsboro
Alert, Database
Gray
Alert, Entry
WhiteSmoke
Alert, mail
Photography & graphic design
Dark Glass
Call, Alert, Chat
Attention, user, warning
MidnightBlue
Alert, warning, Disk
UI
Glaze
warning, messagebox, Alert
64x64
Web Application Icons Set
Gold
Nuvola
Alert, Attention, exclamation
DarkRed
Nuove
Info, Alert, messagebox
CornflowerBlue
Crystal Clear
Arrow, update, download
SandyBrown
Calendar, Alert
SteelBlue
22x22
Message, critial, Alert