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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Avatar, End, bridge
Black
64x64
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Mixed
Pixel
Simply 8-bits #7
Last, Fm
Firebrick
96x96
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Social media
3D
Sweet 16s - free
Fm, Last
DarkRed
16x16
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Glyph
Minicons Social
512x512
Iconic
Last
DarkSlateGray
Smooth
Tango Icon Library
Last, Go
Mobile apps
Free Retina Icon Set
Last, last page, play
60x60
Business & finance
24x24 Free Application Icons
last record, music, media
24x24
right, next, track
SkyBlue
play, last page, right
Network & communications
16x16 Free Application Icons
right, next, media
CornflowerBlue
Audio, Arrow, player
music, last track, media
Flat
Funky - free
OrangeRed
UI
Windows 8 metro style
Metro UI Icon Set
Crimson
SEO & web
Metro Uinvert Dock
256x256
Files & folders
ExplodingBoy Pixel Icons
LightGray
20x20
Coral
Picons Social
Last, Lastfm, Fm
Fm, Last, Lastfm