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Arrows and Universal Actions Icon Set
minimize, Minus, remove
Black
512x512
minimize, remove, delete
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Arrows
Glyph
Navigation Set - Arrows, Part One
fullscreenexit, fullscreen exit, minimize
Signs & symbols
Flat
Circle Icons
reduce, Zoom out, minimize
SandyBrown
Desktop apps
Outline
Minicons
Fullscreen, contract, minimize
full screen, minimize, Fullscreen
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UI
Windows 8 metro style
minimize, window
DarkSlateGray
Mixed
WPZOOM Developer Icon Set
minimize
PNG MORE
Windows 8 icons
26x26
iPhone Toolbar icons
remove, minimize, Exit
Gray
Pixel
Boolean
square, minimize
Gold
16x16
3D
The Spherical icon set
MidnightBlue
128x128
Smooth
User Interface Icons
Close, minimize, expand
80x80