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Signs & symbols
Glyph
Outline style
open, Fullscreen, expand
Black
512x512
Business & finance
Font Awesome
expand
Arrows
Navigation Set - Arrows, Part One
Top, Up, expand less
expand more, expandmore, expand
Navigation Set - Arrows, Part Two
Arrow, Fullscreen, scale
UI
Google Material Design icons
expand, less
more, expand
GlyphPack
Arrows. Android L (Lollipop)
Arrow, expand, Down
Mixed
Geomicons
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Windows 8 metro style
DarkSlateGray
PNG MORE
Mobile apps
Free Retina Icon Set
Move, navigation, Arrows
60x60
24x24 Free Application Icons
DodgerBlue
24x24
Mimi Glyphs
16x16
expand, screen, Full
Metro UI Dock
Mb, expand
256x256
Wireframe mono icons
48x48
Top, right, expand