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Signs
Flat
Line Icon Set
Letter X, cancel, signs
Black
512x512
Universal 11
Error, cancel, wrong
iOS7 Premium
forbidden, signs, cancel
Universal 07
problem, Negative, signs
Universal 06
Bleach, erase, delete
warning, Alert, Caution
cross, Error, wrong
Typicons
Error, Caution, exclamation mark
Elegant Font
Error, notice, warning
Foundation
Road sign, signs, traffic signal
signs, cancel, forbidden
Heyding Controls
Letter X, Error, wrong
Error, Halt, stop