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UI
Glyph
Basic interface
notification, bell, jingle
Black
512x512
Google Material Design icons
ring, volume
Outline
Freeline
Schedule, sound, ringing
Valenticons
valentines, wedding, valentine
DarkSlateGray
Integral
ring, ding, bell
taboo, jingle, bell
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Windows 8 metro style
ring
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Windows 8 icons
26x26
Pixel
Bijou
life, ring
10x10
Blueberry
help, Buoy, ring
OrangeRed
32x32
Fugue Icons
16x16
GIS
delete, ring
DimGray
24x24
Add, ring