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Social media
Glyph
E-commerce
remove, less, round
Black
512x512
Full, substract, remove
UI
GlyphPack
square, Minus
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Minus
Business & finance
Math & Business
stop, Minus, math
506x512
Very Basic. Android L (Lollipop)
Minus, math, remove
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Mixed
Simple Icons
Signs & symbols
SquareNav
subtract, Minus, square
Typicons
Windows 8 metro style
plus, Minus
Freecns Cumulus
Minus, remove, delete
Cloud, delete, Minus
Travel & hotels
Meanicons
Music & multimedia
Sound and Audio
speaker, volume, Minus
Computer & hardware
Ionicons
Minus, Empty
round, Minus
Circled, Minus
48x48 Free Time Icons
festive, event, delete
48x48