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Mixed
Outline
bitsies!
warning, Alarm, Alert
Black
512x512
fault, problem, Error
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Cartoon
Monochrome Icon
Calendar, watch, timer
Silver
478x512
Amenities - Outline
fire, Alarm, Alert
UI
Linecon
Alert, Clock, time
Alert, Alarm, Clock
Freeline
history, watch, event
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Flat
Krispicons- Modern Flat Icons Freebie
timer, Horn, Alert
Purple
111x111
Attention, danger, Caution
Firebrick
Handdrawn
Social Messaging & Productivity
danger, Attention, Error
Alarm, compass, Alert
event, Alarm, Direction
time, Clock, watch
Fire
fire, Alert, warning
Crimson
Glyph
Simple darkcon
problem, warning, Caution
Watchify v1.0 - 70px
Alert, warning, bell
Watchify v1.0 - 80px
bell, Alarm, warning
Watchify v1.0 - 32px
Alert, warning, chime
ForAll
warining, Alert, Error
LightSeaGreen
Very Basic. Android L (Lollipop)
problem, Attention, warning
Google Material Design icons
Alert, Battery
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Computer & hardware
Mirrored Twins (hollow)
sign, Caution, warning
Social media
Social Media
ring, Alarm, bell
Gold
Desktop apps
Minicons
Alert, Prompt, Attention