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Interface
Flat
Material Design
report, warning, exclamation mark
Black
512x512
shapes
Iconographicons
octagon, Geometric Shape, Geometric Figure
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Free icons for Windows8/Metro
octagon
DarkSlateGray
LED
cross, octagon, fram
DarkGray
16x16
cross, octagon
Firebrick
octagon, warning, Error
SandyBrown
Fugue
exclamation, warning, wrong
Goldenrod
octagon, plus, Add
Green
frame, cross, octagon
frame, octagon, subtract
DarkRed
Information, octagon, Info
RoyalBlue
help, octagon, question
frame, right, correct
subtract, Minus, octagon
octagon, frame, Add
warning, exclamation, Error
Khaki
check on, yes, octagon
help, question, frame
Information, Info, octagon
PNG ICO ICNS SVG MORE
Mixed
Botcons
octagon, bot, Blue
SkyBlue
Social media
Flat Octagon
Rss, octagon
DarkOrange
256x256
octagon, Wordpress
SteelBlue
octagon, Tumbler