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UI
Outline
ikooni outline: Free Basic
Caution, Error, danger
Black
512x512
Error, Caution, Alert
Glyph
Google Material Design icons
Error
Freecns Cumulus
warning, Error, Attention
mark, exclamation, Error
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Handdrawn
Hand Drawn Web Icon Set
Error, Key
128x128
user, Error
3D
Gloss Basic Icons
Error, bookmarks
32x32
Message, Error
trashcan, Full, Error
Error, Female, user
user, Error, male
Smooth
Ultimate Gnome
netstatus, Error
256x256
Dialog, Error
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Pixel
Lynx Black
Error, netstatus
22x22
Gnome icons
Error, next
16x16
previous, Error