PNG ICO ICNS MORE
Photography & graphic design
3D
Dark Glass
Attention, user, warning
MidnightBlue
128x128
Alert, warning, Disk
DarkSlateGray
Computer & hardware
Smooth
Futurosoft
Adept, warning, notifier
Black
32x32
UI
Glaze
warning, messagebox, Alert
64x64
PNG MORE
Mixed
Pixel
Twotiny
Alert, File, exclamation
Lavender
14x18
notification, Alert, warning
SaddleBrown
4x15
Network & communications
Oxygen
remove, delete, warning
Gray
48x48
Dialog, warning, Alert
Orange
Signs & symbols
34aL volume 3.2 SE
Message, exclamation, warning
Tomato
24x24
ASP.NET icons
Attention, warning
Olive
16x16
warning, Attention
OrangeRed
Desktop apps
Circular
Alert, exclamation, warning
Gold
Function icons
noflash, Camera, warning
warning, Camera
Error, warning, Info
DarkRed
warning
LightSteelBlue
Database, warning
Gainsboro
warning, Folder
DarkKhaki
warning, image
DarkGray
Alert, warning, user
Teal
warning, Users, two
exclamation, warn, warning
DarkGoldenrod
triangle, sign, Caution