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Retro items
Alarm, timer, Error
DarkSlateGray
512x512
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Signs
Flat
Computer security set
notice, Signaling, warning
Essential Collection
prohibition, signs, Error
shapes
Vaadin icons
Close, Circle, Error
shapes, Circle, symbol
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Free icons for Windows8/Metro
Error
PNG MORE
Icons8 — ever-growing set of Windows 8 (Metro style) icons
26x26
User icons
27x27
32x32
Hand Drawn Web Icons
Error, photo
128x128
Carpelinx
Book, reading, exclamation
Dark Glass
kmixdocked, warning, Error
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Free Common
Alert, Error, wrong
64x64
Alert, wrong, exclamation
exclamation, warning, Alert
wrong, exclamation, warning
Alert, wrong, Error
Error, wrong, Alert
exclamation, warning, Error
exclamation, Alert, warning
Alert, warning, Error
Nuove
kmixdocked, Alert, wrong
Nuvola
warning, kmixdocked, exclamation
48x48