404
alert
attention
bar
broken
bsod
button
close
computer
confirmation
corrupt
crash
danger
data
dialog
digital
download
error
exclamation
failure
fatal
file
flat
icon
information
interface
internet
message
notification
operating
os
page
pc
pop
popup
problem
screen
sign
signal
software
symbol
system
technology
up
vintage
warning
web
website
window