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Mixed
Outline
Basic Line Icon Set 2
notif, bell, notification icon
Black
512x512
notif, notification icon, bell
Cute Tech Icon Set
bell, ting, notification
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Miscellaneous
miscellaneous, ring, notification
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Glyph
Web Icons
Alert, ring, notification
Twitter UI Set
Alert, notification, ring
bitsies!
warning, Alarm, Alert
Glypho - Free
bell, perspective
Sympletts - Free Vol.1
bell
Simple darkcon
Control, settings, sound
506x512
Watchify v1.0 - 32px
Alert, warning, chime
Pittogrammi
bell, Alarm
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IcoMoon
32x32
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Pixel
IconSweets 2
Alarm, bell, inbox
40x40
inbox, bell, incoming