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UI
Glyph
Windows 8 metro style
time
DarkSlateGray
512x512
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Freecns Cumulus
Clock, Alert, time
Black
iOS7 optimized
Outline
Streamline - Free
time, streamline, Clock
Computer & hardware
Flat
Ballicons (free)
Clock, time
WhiteSmoke
128x128
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Wait, timer, hand-drawn
64x64
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Desktop apps
Simply 8-bits #2
time, chess
Wheat
96x96
Gaming & gambling
Pixel
Simply 8-bits #1
time, Adventure, dog
Goldenrod
Boy, Adventure, time
Smooth
wood leather apple icons
Face, time
516x517
Mixed
WPZOOM Developer Icon Set
time, Clock
Files & folders
3D
Soda Red
soda, machine, time
Firebrick
Linecons Free – Vector Icons Pack
Alarm, time, Wait
Free Game Icons
school, bell, Golden
Photography & graphic design
32x32 Free Design Icons
time, Clock, watch
LightSlateGray
32x32
increase, time, watch
Photorealistic
48x48 Free Object Icons
Month, Organizer, future
48x48
stopwatch, timer, time
GhostWhite
stopwatch, history, watch
Business & finance
48x48 Free Time Icons
Clock, history, watch
Lavender
Clock, minute, timer
Geographical, Zone, time
LimeGreen
minute, watch, time