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Signs & symbols
Glyph
Outline style
Alert, Message, Alarm
Black
512x512
Mixed
Basic icon element
time, Alarm, timer
timer, minute, watch
Free Misc Icon Set 1
stopwatch, watch, time
Free Misc Icon Set 2
Alert, problem, exclamation
Error, Alarm, warning
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Web Icons
Alert, ring, notification
Simple Geometric Icons
Clock, time, event
Amenities - Solid
fire, Alarm
iOS7 optimized
Miu
Alarm, Schedule, time
Alarm, timer, Schedule
Simple darkcon
problem, warning, Caution
UI
Very Basic. Android L (Lollipop)
event, Alarm, Clock
watch, Clock, time
Network & communications
Material Device
Add, Alarm
487x512
Google Material Design icons
Alarm
Alarm, Add
off, Alarm
Alarm, on
Travel & hotels
Meanicons
hour, Clock, meanicons
373x512
Computer & hardware
Ionicons
Pictype Free Vector Icons
bell, Alarm
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Business & finance
48x48 Free Time Icons
warning, medicine, siren
48x48