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Flat Actions 9
invalid, incorrect, x
Black
395x512
incorrect, Close, delete
IndianRed
x, cross, invalid
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Signs & symbols
Glyph
Solid line essential UI icon set
Essential, set, x
512x512
Sports & awards
Fitness icon collection
x, date, Calendar
Mixed
Outline
70 basic icons
delete, Close, remove
Healthcare & medical
Flat
Medical Elements
rays, x
MediumAquamarine
UI navigation
out, sign-out, Close
Crimson
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Basic
Basic, Close, x
Flat Design Icons (Set 2)
discard, unapprove, remove
Lavender
Social Media Network Fill Flat Icon
Direction, way, x
Goldenrod
Computer & hardware
Scripting and programming languages
Coffee, Application, x
Desktop apps
Smooth
System Shade Circles
mac, x, Os
DodgerBlue
System Black Circles
x, Os, mac
System Black Octagons
x, mac, Os
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Anchor
x
Gainsboro
128x128
Geomicons
Octicons
320x512
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UI
Windows 8 metro style
x, men
DarkSlateGray
26x26
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Formula, hand drawn, square root
64x64
Iconic
Photography & graphic design
3D
32x32 Free Design Icons
Close, cancel, Exit
Firebrick
32x32