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Warning
signs, notification, instruction
Black
512x512
notification, instruction, know
warning, notification, instruction
warning, signs, notification
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Signs
Flat
Architecture & Construction
warning, sign, electricity
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Factory
Alert, warning, exclamation
Gray
Business & finance
Glyph
Font Awesome
warning
Architecture and construction
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signal, shapes, signs
DarkSlateGray
Signaling
Education Elements
traffic sign, Signaling, warning
Network & communications
E-mail
mail, red, warning
IndianRed