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UI
Glyph
Basic interface
notification, bell, jingle
Black
512x512
Outline
Freeline
Schedule, sound, ringing
Free basic
envelope, Message, Rss
CadetBlue
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Flat
Metro UI Icon Set
notification, Area
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Pixel
Bijou
notification
10x10
Smooth
Project icons
notification, good
SteelBlue
32x32
Sketchdock Ecommerce Icons
square, red, Alert
Crimson
24x24