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Signs
Flat
Font Awesome
maths, mathematical, dash
Black
512x512
horizontal, symbol, rounded
Code, signs, Codes
Museum
prohibition, Diagonal, Umbrella
signal, Banned, drinks
Humanitarian Icons 1
Black and white, horizontal, signs
iOS7 Set Filled 1
signs, Squares, Subtraction
iOS7 Set Lined 1
mathematical, signs, maths
Universal 04
Energy, power, line
Laundry Guide
maths, Minus Sign, line
Typicons
document, Archive, line
Foundation
signs, line, Minus Sign
denied, Minus, Minus Sign