PNG ICO ICNS MORE
Signs & symbols
3D
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
Black
64x64
warning, danger, Alert
Prompt, danger, exclamation
Prompt, help, danger
PNG ICO MORE
UI
Gnome Web Icons
Attention, important
unread mail, envelope, mail
Glaze
Folder, important
128x128
Nuvola
warning, important, Attention