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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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Mobile apps
Free Retina Icon Set
Move, navigation, Arrows
60x60
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Mimi Glyphs
16x16
expand, screen, Full
Metro UI Dock
Mb, expand
256x256
Wireframe mono icons
Top, right, expand
48x48