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UI Essence
Alert, power, weather
Black
512x512
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shapes
Flat
Shipping and Handly Linear
Delivery, square, Shipping
Transport
Minimal interface
packing, envelope, mail
Strong Glyph Set
medicine, urgent, Delivery Truck
Buildings
Linear Buildings
Fireman, fire, urgent
Business
Stationery
packing, urgent, Urgency
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Ultimate Gnome
urgent, Emblem
128x128
Humility
32x32
Yatta-Blues
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GNOME Desktop
urgent, software, Gnome
64x64
Mixed
Smooth
Tango Icon Library
update, software, urgent
Business & finance
Glyph
48x48 Free Time Icons
Cartridge, lightning, fastening
48x48
UI
3D
Gnome Web Icons
software, update, Down
Attention, Emblem, important
Emblem, urgent
256x256