PNG ICO ICNS MORE
Oxygen
stop, no, cancel
WhiteSmoke
48x48
Dialog, wrong, exclamation
PNG ICO MORE
Web Application
Box, Dialog
80x80
Fugue
Application, Dialog
16x16
Computer & hardware
Smooth
Crystal Project
Info, stock, Dialog
32x32
PNG MORE
stock, Form, Dialog
24x24
UI
Pixel
Fugue Icons
Social media
Twitter Icons
Dialog, twitter, window
128x128
User Interface Icons
Dialog, Box
Network & communications
Close, Dialog
Dialog, Error