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Signs & symbols
Glyph
Outline style
Alert, Message, Alarm
Black
512x512
Bold Purple (Free Samples)
Alarm, telltale, signal
MediumOrchid
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
Mobile apps
Clean and Simple
Alarm
Tomato
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, Add
off, Alarm
Alarm, on
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Windows 8 metro style
Clock, Alarm
DarkSlateGray
Travel & hotels
Meanicons
hour, Clock, meanicons
373x512
Computer & hardware
Ionicons